Best Exhaust for a N/A 13B
03-17-17, 10:57 AM
#26
MECP Certified Installer
if you have no cans at the back of the car then you're letting most of the noise through. most of the cost of a dual exhaust is the use of 2 mufflers at the back of the car instead of 1 and most of the noise suppression is from the back end, the sharpness is reduced by the presilencer.
my single has 3 mufflers
my duals have 3 mufflers
my single has 3 mufflers
my duals have 3 mufflers
03-21-17, 12:56 PM
#28
Smells like 2 stroke.
I've had a running street driven N/A S4 in one form or another since around 2008. Since then the only system I can't give any advice on is a collected aftermarket manifold. Here's what I've learned, and my 2 cents:
- Factory stock S4 N/A exhaust sucks. All of it is trash. It's extremely restrictive and too quiet. (Duh.)
- The factory manifold is adequate for most street applications as far as power/torque, but sounds horrible unless there are decent mufflers and duals behind it.
- The stock exhaust port "splitters" or "inserts" suck. I like that raspy rotary buzz/whine. It sounds pissed off, like an N/A rotary should.
- If you want everybody to hate you, don't run a presilencer or cat. Run a 2.5" or 3" from the manifold back with a single exit straight-through muffler on the left side of the car. You've been warned. It is loud. It is obnoxious. It is annoying. Cops will use it against you. Your ears won't last long. Most self respecting women will not ride with you.
- Duals sound great but suck for high end power production, and they weigh a lot.
- True duals provide great torque.
- Racing beat full true dual "road race" exhaust system is the bomb-diggity. The bees knees. It is worth every penny. It does not provide a catalytic converter. Use at your own risk.
- Factory stock S4 N/A exhaust sucks. All of it is trash. It's extremely restrictive and too quiet. (Duh.)
- The factory manifold is adequate for most street applications as far as power/torque, but sounds horrible unless there are decent mufflers and duals behind it.
- The stock exhaust port "splitters" or "inserts" suck. I like that raspy rotary buzz/whine. It sounds pissed off, like an N/A rotary should.
- If you want everybody to hate you, don't run a presilencer or cat. Run a 2.5" or 3" from the manifold back with a single exit straight-through muffler on the left side of the car. You've been warned. It is loud. It is obnoxious. It is annoying. Cops will use it against you. Your ears won't last long. Most self respecting women will not ride with you.
- Duals sound great but suck for high end power production, and they weigh a lot.
- True duals provide great torque.
- Racing beat full true dual "road race" exhaust system is the bomb-diggity. The bees knees. It is worth every penny. It does not provide a catalytic converter. Use at your own risk.
03-21-17, 01:27 PM
#29
- If you want everybody to hate you, don't run a presilencer or cat. Run a 2.5" or 3" from the manifold back with a single exit straight-through muffler on the left side of the car. You've been warned. It is loud. It is obnoxious. It is annoying. Cops will use it against you. Your ears won't last long. Most self respecting women will not ride with you.
even other rotary owners will shake their head as you drive by. win?
- Duals sound great but suck for high end power production, and they weigh a lot.
weight part is accurate, power production statement is not.
- True duals provide great torque.
uh no, backpressure provides torque. to which your exhaust piping should be sized appropriately. same as the statement you made above.
- Racing beat full true dual "road race" exhaust system is the bomb-diggity. The bees knees. It is worth every penny. It does not provide a catalytic converter. Use at your own risk.
true duals usually compromise a fair amount of torque loss for a fair amount of top end RPM power. unfortunately the top end is where the stock intake really cuts into high RPM power. 7000-7300 RPMs is where your n/a intake begins to choke power, no matter what fancy porting you have. so how is it the bomb? it actually belongs nowhere other than on a very highly modified n/a that lives at high RPM use. something akin to a custom peripheral port setup would pair well with it.
even other rotary owners will shake their head as you drive by. win?
- Duals sound great but suck for high end power production, and they weigh a lot.
weight part is accurate, power production statement is not.
- True duals provide great torque.
uh no, backpressure provides torque. to which your exhaust piping should be sized appropriately. same as the statement you made above.
- Racing beat full true dual "road race" exhaust system is the bomb-diggity. The bees knees. It is worth every penny. It does not provide a catalytic converter. Use at your own risk.
true duals usually compromise a fair amount of torque loss for a fair amount of top end RPM power. unfortunately the top end is where the stock intake really cuts into high RPM power. 7000-7300 RPMs is where your n/a intake begins to choke power, no matter what fancy porting you have. so how is it the bomb? it actually belongs nowhere other than on a very highly modified n/a that lives at high RPM use. something akin to a custom peripheral port setup would pair well with it.
i also find that people tend to think that a louder car is faster, which is a load of horseshit and all in your brain. load up your torque app and do some pulls and compare with actual figures. your examples lead me to actually make this point. so do a lot of honda owners who detune their cars with loud obnoxious exhausts and "cold air intakes", truth is their cars are likely slower than they were when untouched.
i said this all 10 years ago, and here i am still repeating it.
Last edited by RotaryEvolution; 03-21-17 at 01:42 PM.
03-21-17, 07:15 PM
#30
Smells like 2 stroke.
weight part is accurate, power production statement is not.
I said duals, not true duals. I should have clarified this by saying a single in, dual exit exhaust like the stock system. All it could possibly do is quiet the exhaust, add weight, and add symmetry to the rear of the car. Mazda's designers loved symmetry and they wanted the FC to sound civilized. I fail to see how adding a pipe that has to make an unnecessary turn will increase power. A larger single exhaust will at the very least make the same power.
uh no, backpressure provides torque. to which your exhaust piping should be sized appropriately. same as the statement you made above.
I guess I don't understand the need for backpressure on a rotary, any aux port actuation needs aside. Do you mean scavenging?
true duals usually compromise a fair amount of torque loss for a fair amount of top end RPM power. unfortunately the top end is where the stock intake really cuts into high RPM power. 7000-7300 RPMs is where your n/a intake begins to choke power, no matter what fancy porting you have. so how is it the bomb? it actually belongs nowhere other than on a very highly modified n/a that lives at high RPM use. something akin to a custom peripheral port setup would pair well with it.
RB true duals seem to pair well with my "stock" 6 port N/A. Maybe the torque increase I've noticed is from the lightweight steel flywheel.
It's the bomb because its the last system I'll probably ever need to buy, the car makes great power and torque with it, and it sounds like music to my ears. My car does live in the high-rpm range.
In general, going too big on exhaust for an n/a just results in a slower overall car with almost no gains. tuning exhaust diameter and backpressure is actually a science for gaining the best all around performance and the stock exhaust isn't anywhere near as bad as you make it sound.
i also find that people tend to think that a louder car is faster, which is a load of horseshit and all in your brain. load up your torque app and do some pulls and compare with actual figures. your examples lead me to actually make this point. so do a lot of honda owners who detune their cars with loud obnoxious exhausts and "cold air intakes", truth is their cars are likely slower than they were when untouched.
i said this all 10 years ago, and here i am still repeating it.
I will admit I was going for the best combination of quality sound, longevity, and power. That's why I have the racing beat true duals on my car. Behind the racing beat manifold and presilencer, I have 2-1/4" O.D. pipe going to a cheap pair of magnaflows in the back. This is probably too big for your taste. Not enough backpressure and whatnot.
I like the sound of true duals over a collected system. I don't think a single or collected exhaust is all it's cracked up to be.
And here's why:
I've raced a gutted (no interior, no sunroof, no spare tire, no stereo) N/A S4 with an OBX header and a 2-1/2" to 3" single exit system. My car has a full interior, including spare tire, jack, stock stereo, and sunroof.
He couldn't pull from me, we were neck and neck. I refuse to believe our respective exhaust systems were a factor in that race, and clearly our cars have two completely different configurations.
I have also raced an N/A S4 with a 2-1/4" single exit exhaust. He couldn't pull away either.
I'm not trying to say my car is the fastest because of it's exhaust- I know my pipes are too big, should be collected, and the whole thing is overkill. I'm saying my exhaust has has come down to sound for me. I think mine sounds better, and certainly doesn't seem slower than similar cars with alternative systems.
03-22-17, 09:55 AM
#31
comparing 2 RX7's is like comparing 2 completely different cars.
i rarely come across 2 cars in the same vicinity that are both running properly.
you can either run a quarter and see the time difference, dyno it and see the before and after power curve changes or time it on a basic course and average the results for before and after comparison.
i rarely come across 2 cars in the same vicinity that are both running properly.
you can either run a quarter and see the time difference, dyno it and see the before and after power curve changes or time it on a basic course and average the results for before and after comparison.
03-22-17, 10:21 AM
#32
I've always felt Racing Beat products to be of very good quality. A good friend of mine had the true dual exhaust that sounded nice, but was a little loud for my tastes. I've got the RB catback, and love it. My only issue that seems to be quite common is that the exhaust tips don't sit in the bumper openings the same way. Bending or modifying of the hangers can fix this, according to my research. It's never bothered me enough to do it, however.
It is a heavy setup, but who gives a damn? You're not really going to notice.. Unless max weight savings is what you're going for, and at that point you wouldn't be running a dual muffler setup anyway.
My system has survived Vermont winters with all the salt. The welds are very good.
Highly recommended.
It is a heavy setup, but who gives a damn? You're not really going to notice.. Unless max weight savings is what you're going for, and at that point you wouldn't be running a dual muffler setup anyway.
My system has survived Vermont winters with all the salt. The welds are very good.
Highly recommended.
03-22-17, 12:28 PM
#33
Smells like 2 stroke.
comparing 2 RX7's is like comparing 2 completely different cars.
i rarely come across 2 cars in the same vicinity that are both running properly.
you can either run a quarter and see the time difference, dyno it and see the before and after power curve changes or time it on a basic course and average the results for before and after comparison.
i rarely come across 2 cars in the same vicinity that are both running properly.
you can either run a quarter and see the time difference, dyno it and see the before and after power curve changes or time it on a basic course and average the results for before and after comparison.
03-22-17, 01:10 PM
#35
When shopping for Racing Beat exhausts, keep an eye on what you're ordering. They offer several mild steel products, WHICH WILL RUST AND FALL APART. Of course, this is if you live near the coast or in an area that salts the roads.
Also, I had the full RB true dual exhaust. I had a custom exhaust fabricated and made more power (dyno proven) for nearly half the price.
Also, I had the full RB true dual exhaust. I had a custom exhaust fabricated and made more power (dyno proven) for nearly half the price.
03-22-17, 01:58 PM
#36
Red Pill Dealer
iTrader: (10)
Could you give us some clues? Single? Header tube length and dia? Presilencer?
03-23-17, 11:36 AM
#38
That's correct, but my custom exhaust net me 10ft/lbs more torque than the Racing Beat. That was important to me.
To answer your question, I'm running the RB road race header into a 2.5" ID collector, presilencer, and 2.5" piping back to a straight through magna flow muffler.
To answer your question, I'm running the RB road race header into a 2.5" ID collector, presilencer, and 2.5" piping back to a straight through magna flow muffler.
03-23-17, 12:00 PM
#39
Red Pill Dealer
iTrader: (10)
Thanks! I've also read about the engine you're running in the NA forum. Single presilencer and single out?
04-08-17, 07:53 AM
#41
I'm running the RB cat-back and Bonez hi-flow cat with per-silencer on my 90 GXL. The RB is a relatively quiet exhaust, produces a nice tame sound and has a long lifetime. I've must have had it my car for 12+ years now. It's showing no signs of rust. I've had a Borla SS cat-back on my for a short period prior to the RB. It was way too loud. I mean excessively loud to the point where you need ear plugs while driving at highway speeds. I dumped it and bought the RB exhaust.
Last edited by DeaconBlue; 04-08-17 at 09:23 AM.
04-08-17, 09:16 PM
#42
Rotary Freak
OK, I'm going to be the odd duck here and most of you will plotz, but...
If I could find the parts for the complete OEM system at anything like a reasonable price, that is what I would put on my convertible.
I've had he Bonez hi-flow system on my car for about 13 years (last nine in the garage until a week ago) and it annoys the hell out of me. I hated it before I parked the car, I hate it now. With the top down it is not too bad, but closed inside the roof it is a nightmare to me.
I'd love to get the factory quiet back, but can't find any system except OEM that will do that.
If I could find the parts for the complete OEM system at anything like a reasonable price, that is what I would put on my convertible.
I've had he Bonez hi-flow system on my car for about 13 years (last nine in the garage until a week ago) and it annoys the hell out of me. I hated it before I parked the car, I hate it now. With the top down it is not too bad, but closed inside the roof it is a nightmare to me.
I'd love to get the factory quiet back, but can't find any system except OEM that will do that.
04-09-17, 09:48 AM
#43
OK, I'm going to be the odd duck here and most of you will plotz, but...
If I could find the parts for the complete OEM system at anything like a reasonable price, that is what I would put on my convertible.
I've had he Bonez hi-flow system on my car for about 13 years (last nine in the garage until a week ago) and it annoys the hell out of me. I hated it before I parked the car, I hate it now. With the top down it is not too bad, but closed inside the roof it is a nightmare to me.
I'd love to get the factory quiet back, but can't find any system except OEM that will do that.
If I could find the parts for the complete OEM system at anything like a reasonable price, that is what I would put on my convertible.
I've had he Bonez hi-flow system on my car for about 13 years (last nine in the garage until a week ago) and it annoys the hell out of me. I hated it before I parked the car, I hate it now. With the top down it is not too bad, but closed inside the roof it is a nightmare to me.
I'd love to get the factory quiet back, but can't find any system except OEM that will do that.
Are you running factory mufflers?
04-09-17, 07:35 PM
#44
Rotary Freak
04-10-17, 05:47 PM
#46
Rotary Freak
I appreciate the input... The last racing beat system I had was on my 80. You could hear me coming for 4 blocks! Of course that was a header that dumped directly into my muffler and that was 30 years ago 
so I have no relevant experience of the RB system.
But unless there was a way to hear it first, I will need to pass on spending ~$1400 for a full RB system that I may not like. I think I can assemble the OEM components.
To be honest, I have no need for any performance parts on my vert. It used to be a very pleasant cruising car and that I want I want to get it back to.
Thanks again.
so I have no relevant experience of the RB system.But unless there was a way to hear it first, I will need to pass on spending ~$1400 for a full RB system that I may not like. I think I can assemble the OEM components.
To be honest, I have no need for any performance parts on my vert. It used to be a very pleasant cruising car and that I want I want to get it back to.
Thanks again.
04-30-17, 10:53 PM
#49
Thanks! This info is what I have been looking for. I have a '90 GXL with a CorkSport header, a CatCo replacement main cat and a Borla cat back exhaust - the combo is just way too loud! I have seen where a couple others that have run the Racing Beat n/a 2" OD inlet pipe mufflers #16443 and 16444 with the Borla Y-pipe which also has 2" OD pipes. So now I am on the look out for a pair of Racing Beat n/a mufflers (or complete n/a cat back system) in hopes that they will quite the exhaust down to a more tolerable level so I can enjoy driving my RX7 again.
05-01-17, 08:09 AM
#50
Smells like 2 stroke.
