s5 na w/ aftermarket single out exhaust, trying to silent it without goin dual?
11-07-11, 10:48 PM
#1
Full Member
Thread Starter
s5 na w/ aftermarket single out exhaust, trying to silent it without goin dual?
Do presilencers do a good job of quieting the exhaust without cutting power too much, over a high-flow cat? Any other methods of quieting an exhaust without robbing whatever power i have?
11-08-11, 12:33 AM
#2
Rotary Enthusiast
Honestly, I had an S5 n/a with header, and a dual exhaust with two mufflers per side. It was still loud.
A single exit n/a will be loud no matter what you do to it.
A single exit n/a will be loud no matter what you do to it.
11-08-11, 09:26 AM
#3
What kind of muffler are you using? If you can see through it, it's going to be loud. A presilencer does something but typically not much. There are a few things that determine how effective a muffler is. The first is design. Obviously one that is straight through will typically be louder than one that isn't. Not all straight through mufflers flow well though. A perforated core muffler is the best choice. A louvered core muffler is a paper weight that shouldn't be used by anyone. Hugely restrictive yet still straight through designs. Many ricer mufflers fit in this category. Not all chambered mufflers like Flowmasters are quiet though since they have no muffler packing. A rotary typically likes a muffler that uses packing that doesn't rely solely on chambers. Keep in mind that just because something isn't straight through doesn't necessarily mean it doesn't flow well. It may or may not. It's all down to design.
The second thing is size. The larger it is, the quieter it will be since it has more area assuming of course we are comparing a larger and a smaller muffler of the same internal design.
The third thing is the pipe through size. If we have a muffler with a 2" bore and compare it to one with a 3" bore, the 3" will be louder since it has less surface to volume internally which means less noise will interfere with the muffler itself and will pass through. Using 2 mufflers over 1 is one way to help this. A single 3" muffler will have a little less flow than dual 2-1/4" mufflers. However the dual setup will have far more muffling power.
Keep in mind how much a muffler can ultimately flow is irrelevant if your engine can't flow that much. If muffler A flows twice as much as muffler B but muffler B flows more than your engine can feed it, neither makes any more or less power than the other. If you have an n/a, you don't need any more than a single muffler with a 2-1/2" through. A 3" is overkill and is going to be quiet loud. A presilencer will help things but if it is small it won't do much. You could go back to a dual system, run 2 Dynomax Superturbo mufflers, see no loss in power and have a very quiet car. Hopefully you aren't running a 6" or 7" round muffler. It isn't going to do much.
What exhaust setup do you have now? How large are your pipes? What kind of muffler are you using?
The second thing is size. The larger it is, the quieter it will be since it has more area assuming of course we are comparing a larger and a smaller muffler of the same internal design.
The third thing is the pipe through size. If we have a muffler with a 2" bore and compare it to one with a 3" bore, the 3" will be louder since it has less surface to volume internally which means less noise will interfere with the muffler itself and will pass through. Using 2 mufflers over 1 is one way to help this. A single 3" muffler will have a little less flow than dual 2-1/4" mufflers. However the dual setup will have far more muffling power.
Keep in mind how much a muffler can ultimately flow is irrelevant if your engine can't flow that much. If muffler A flows twice as much as muffler B but muffler B flows more than your engine can feed it, neither makes any more or less power than the other. If you have an n/a, you don't need any more than a single muffler with a 2-1/2" through. A 3" is overkill and is going to be quiet loud. A presilencer will help things but if it is small it won't do much. You could go back to a dual system, run 2 Dynomax Superturbo mufflers, see no loss in power and have a very quiet car. Hopefully you aren't running a 6" or 7" round muffler. It isn't going to do much.
What exhaust setup do you have now? How large are your pipes? What kind of muffler are you using?
11-08-11, 01:10 PM
#5
Full Member
Thread Starter
Stock manifold, aftermarket cat (it's not high flow, just a cat) followed by corksport power series single out cat-back. I have been thinking about getting a presilencer for my current setup to replace the cat or going with the racing beat dual cat back, presilencer and headers. I don't know if i want headers with my current setup, with noise on my mind.
11-08-11, 01:26 PM
#7
Headers will only make it louder. Much louder. I have personally never been a fan of Corksport and can't stand their exhausts. They cater to the ricer crowd due to their insane amount of noise. A presilencer isn't going to help you much. The RB exhaust systems are quiet and aren't going to hurt power. Yes they cost a bit and are a bit heavy but the reality is that they are durable and have a nice livable noise level an tone.
The Racing Beat true dual system gives nice power gains but I personally can't stand the tone of it. I think dual exhausts are the worst sounding systems out there, regardless of their performance level. Rotaries sound like absolute crap with them. The beauty is gone. They sound like someone crossing a Harley with a lawnmower. Their standard cat back with header and presilencer sounds much nicer. Headers aren't loud with their system.
The Racing Beat true dual system gives nice power gains but I personally can't stand the tone of it. I think dual exhausts are the worst sounding systems out there, regardless of their performance level. Rotaries sound like absolute crap with them. The beauty is gone. They sound like someone crossing a Harley with a lawnmower. Their standard cat back with header and presilencer sounds much nicer. Headers aren't loud with their system.
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11-08-11, 02:45 PM
#8
oops, I meant:
*headers don't seem to add much appreciable noise with the RB catback
Good point, I always forget to mention that they last forever.. I've yet to hear of/see one fail.
*headers don't seem to add much appreciable noise with the RB catback
Originally Posted by rotarygod
Yes they cost a bit and are a bit heavy but the reality is that they are durable and have a nice livable noise level an tone.
11-09-11, 11:52 AM
#9
Stock manifold, aftermarket cat (it's not high flow, just a cat) followed by corksport power series single out cat-back. I have been thinking about getting a presilencer for my current setup to replace the cat or going with the racing beat dual cat back, presilencer and headers. I don't know if i want headers with my current setup, with noise on my mind.
11-09-11, 12:42 PM
#11
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Stock manifold, aftermarket cat (it's not high flow, just a cat) followed by corksport power series single out cat-back. I have been thinking about getting a presilencer for my current setup to replace the cat or going with the racing beat dual cat back, presilencer and headers. I don't know if i want headers with my current setup, with noise on my mind.
Racing Beat catbacks sound good, are quiet, and look basically stock. I wouldn't hesitate to even run a header (which will make it a small bit louder than a stock manifold), with a RB catback. Actually, I've always wanted to hear a header to a straight pipe to a RB catback. I think that would sound amazing!
If you want to keep your same setup while still quieting the car down, I recommend throwing in a Borla XR-1 presilencer in there somewhere, or a Racing Beat presilencer. Just remember that by deleting your cat, it will make it much louder. Cats do soooo much for keeping a car quiet.
11-09-11, 02:21 PM
#12
Ruckin'AwesomeFC
I run a dual muffler inline setup 3" catback custom made with stock cat and stock downpipe...no louder then your stock 2012 Ford Mustang GT with the pedal down.
11-10-11, 12:10 PM
#13
I had a Corksport cat back exhaust on one of my cars... it was stupid loud, and gave no power.
I had racing beat headers, presilencer, dual RB RSR mufflers on my old NA.. NOT loud at all, and gave power.
I have racing beat 3" downpipe, to test pipe, to dual RB RSR mufflers on my TII, NOT loud at all, and gives power.
I had racing beat headers, presilencer, dual RB RSR mufflers on my old NA.. NOT loud at all, and gave power.
I have racing beat 3" downpipe, to test pipe, to dual RB RSR mufflers on my TII, NOT loud at all, and gives power.
01-17-12, 01:04 PM
#20
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the borla by itself is going to be on the loud side, although they have a nicer note than say the CS muffler.
like RG says, the muffler's ability to muffle is related to its physical size. the borla muffler cans are all on the small side.
and borla's are the most expensive of the magnaflw/dynomax/borla trio
the borla's work nicely with a second muffler though. i did a turbo car with the RB turbo back presilencer into a borla, and it sounded great and was quiet enough to be totally fine.
i have a borla on the P port, by itself (the presilencers died) and its tinny and buzzy
like RG says, the muffler's ability to muffle is related to its physical size. the borla muffler cans are all on the small side.
and borla's are the most expensive of the magnaflw/dynomax/borla trio
the borla's work nicely with a second muffler though. i did a turbo car with the RB turbo back presilencer into a borla, and it sounded great and was quiet enough to be totally fine.
i have a borla on the P port, by itself (the presilencers died) and its tinny and buzzy
01-17-12, 06:39 PM
#21
They are on the small side. I worried about that before placing the order. Why does Dynomax make a muffler with stainless or ceramic packing?
My current set up is a single 2.5" with an UltraFlow that's blown out. A conversation at cruise is difficult to put it mildly. I'm going to put the presilencer after the cat so maybe I'll be okay.
My current set up is a single 2.5" with an UltraFlow that's blown out. A conversation at cruise is difficult to put it mildly. I'm going to put the presilencer after the cat so maybe I'll be okay.
01-17-12, 07:03 PM
#22
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I run a full RB set up in my NA AutoVert, and the exhaust note wasn't bad. But I wanted quieter since I'd be driving to client in my business suit, so wanted to tone it down even more. Solution was to replace the RB exhaust cans with stock cans, everything else the same. MUCH quieter now.
Futher comparison, I also run RB REV II downpipe and presilencer in both TurboVerts, but with REV II cans on the S4 and old school REV cans on the S5. My S5 is just a bit quieter.
Futher comparison, I also run RB REV II downpipe and presilencer in both TurboVerts, but with REV II cans on the S4 and old school REV cans on the S5. My S5 is just a bit quieter.
01-17-12, 11:25 PM
#23
Eats, Sleeps, Dreams Rotary
Get a high-flow cat, or at least a working stock cat.
It will make your car smell less, and be quieter.
And if you get a big racing-style exhaust, ALWAYS ALWAYS ALWAYS drive with a silencer in the tip unless you're at the track. They are NOT designed to be driven on the street without one.
If you get a single-sided one, make sure it has at least two silencers in the catback, not a straight exhaust design. I think the HKS Silent Power exhausts are like this.
Silencer filling and design also affects noise. Generally speaking the bigger the muffler is, the quieter. So if the muffler is only a little wider than the tip, it's going to be LOUD.
I think steel wool is quieter than simple baffles.
Just how much louder are headers when you have a cat still installed, anyway? I wonder if wrapping them with heat tape helps.
It will make your car smell less, and be quieter.
And if you get a big racing-style exhaust, ALWAYS ALWAYS ALWAYS drive with a silencer in the tip unless you're at the track. They are NOT designed to be driven on the street without one.
If you get a single-sided one, make sure it has at least two silencers in the catback, not a straight exhaust design. I think the HKS Silent Power exhausts are like this.
Silencer filling and design also affects noise. Generally speaking the bigger the muffler is, the quieter. So if the muffler is only a little wider than the tip, it's going to be LOUD.
I think steel wool is quieter than simple baffles.
Just how much louder are headers when you have a cat still installed, anyway? I wonder if wrapping them with heat tape helps.
01-18-12, 08:42 PM
#24
Full Member
headers are crazy loud even with them wrapped. it sounded pretty bad with the stock mufflers. i did some "titanium" wrap and i don't think it did anything for sound. the only way is to do rb cat back i think.
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