How do i make my fc louder
 

I have an 88 fc n/a put a cat back exhaust on it a few months ago but not as loud as i would like, i already removed the gay silencer inside the pipe, will removing the cat make it much louder? what does any recommend/have on theres, thanks:icon_tup:

Install a high flow cat or a resonator in place of the cat. Replace the exhaust manifold with a header.

But honestly, why? Just a little louder then stock is nice and aggressive. It's not about the amount of noise, it's the quality of the noise. Why have a sub 200HP car that is louder then a jet dragster?

Unbolt the exhaust manifold from the side of the engine, and leave the exhaust system in the garage.

are u serious there? just asking i have mine with all cats removed and striaght free flow the rest the way and it does sound like a mini jet. real crisp and clear when im getting on it.

alright i like rotary rrockets answer the best haha..but ill probably just end up removing the cats even if it doesnt give it any more power i kinda want it to be louder than my neighbors eclipse and honda..sh*t pisses me off

just remember that if you remove your catylitic converter and install a high flow cat or straight pipe, make sure you install the pipe and flange on the side of the new converter for the pressure tube for the 5th and 6th ports. disregarding that tube will result in a MUCH slower 7 and you will hurt overall performance.

Are there any performance cats that have holes for those tubes already?

MUCH slower? I dont have that crap hooked up. Still spins through 1st, second and chirps third.

THrowing rocks down the oil fill tube always makes for a louder car.

My personal favorite (when it comes to noisemakers) is a 3" straight pipe with NO cats, NO resinators, NO muffler and a spark cut (hard cut 2 stage) rev limiter.


I'm going to end my post there. I've been "warned" by the mods enough.....

So let me get this straight, you have your aux. port actuators non-functional? Or just wired open?

The first option means plenty of top-end power lost since you will turn your 6-port engine into a 4-port. Roughly 25hp lost.

The second option makes the car have less torque below 3800 RPM due to decreased intake air velocity. This isn't a good idea on an engine that is already short on torque. The only way you're not going to notice it is if you never drop below 3800 RPM (ie a track car). It'll be very obvious at every stop-sign or stop-light. I've tried it when testing aux. ports, and it makes the car anemic until 3k+ RPM.

Both are great ways to make the car slower, but for different reasons.

1. Remove cat will make it fairly loud.

2. Need cat? unbolt y-pipe from cat and add a few washers between the two to make a 1/4" gap - makes it throaty as hell and you can easily undo this to make it "normal".

3. Got cash? Buy a RB road race system - sounds beautiful!

Rotary Performance at http://www.rx7.com .

will headers add any hp and will they make it sound better if it just a free flow system? 86 na

Of course a header will add power. But you also have to free up the rest of the exhaust.

take off the fast and the furious spolier and youll be faster and louder.:icon_tup::lol:


oh a helpful note, becareful removing your cat on an n/a your car will be too loud if its straight piped. you can really only get away with that on a turbo, since the turbo blankets all that noise.

blindboxx that spoiler adds 43.5 rwhp and keeps me on the highway when im going 169 mph

im just ripping the cat off

lol. take 100 away from that numba and youve got mah favorite numba!:69:


on a serious note.. why dont you just gut your cat out.. that way you wont fail the inspection part of smog?


edit: 69 posts! major lulz

if you want really loud, cant you just straight pipe from the resonators to the hi-flow cats then to the exhaust. if you want super loud, remove that exhaust not so much my style

This doesn't apply to s5 FC's does it?

getting my car inspected is not an issue so im getting rid of the cats, and im keeping my muffler on

if i was in ur shoes witch i was less than 6 months ago i would just replace the cats with race pipe and get free flow mufflers if you dont alrdy. and if ur ports dont open witch mine wouldnt. then u can always get a msd or related rpm switch set it to 3800 rpm and hookm it to a air pump (the internal part of a bike tire pump) it must be electric. hook it upthey a write up on rotary resurrection on how to hook it up.(if u get a adjustable switch instead of msd u wont need the proper pills to set it. only cost me 50$ for the switch(ebay) and 15$ for the pump(bought at walmart). now i have a loud race exhuast and my ports still open perfectly.

sounds like a gooood idea, ill have to keep that in mind

For what it's worth, when I had my '86 Sport, I had Racing Beats' Header and Presilencer to Apexi Dual N1s and it was amazingly loud. I'd look into replacing the manifold with a header and remove the cat and go straight pipe like everyone else has said, or use RB Presilencer The RB presilencer has the air tube for the 5th and 6th ports.

Wow. I'm on the other side of the spectrum and want mine quieter. I live in CA where the cops are all over my ass if I stand out at all.

What cat back are you running?

if quiet want u want they make a in muffler or in pipe silencer thats in the shape of a cone. no air restriction and blankets loads of noise. there usually for muscle cars but should work just the same.

or he can just get the exhaust butterfly valves? apperently from what ive herd, mustang guys use em?

Keeping the NAs quite is a bit harder, especially when there is a header involved. In my opinion anyway, it is far more important to have a reasonable exhaust note in an NA. After all, almost every NA 13B is making less then 200HP, so what excuse does it have to be loud? My 500HP 13B is only a bit louder then the Racing Beat REVII exhaust, just so you have a frame of reference and see where I am coming from. Loud can be fun for a little while, then it just gets on everyone's nerves.

If you want to keep the car quiet, running multiple resonators is the key. For NA, I'd suggest two resonators like the Vibrant Ultra Quiet in the midpipe. Then in each branch of the "Y" pipe, place a Vibrant 12" Bottle resonator. Then you can use any reasonable muffler and still have a very tolerable car. Even better is an offset muffler, though they should be sized larger (3") as they don't flow as well as the flow through mufflers. Yeah, this is a lot of resonators, but it will still weigh less then the stock cats and they won't really hurt flow.

Im either removing the cats or getting some racing beat headers, eaither way should make for a little more noise,
cops dont really do much ive been pulled over quite a few times already in my truck for noise they just tell me to get it fixed and see if im drunk haha

when i get my headers im going to use a resonator to connect it to the existing pipe. since obviously a header will increase sound and its alrdy loud and is that 500 rwhp or base and is that a t2 or NA?

Yeah with headers and a straight pipe back i can imagine that being a little loud

Sorry, should have mentioned. This is a bridgeported turbocharged NA engine, and that's 500 wheel HP. Now, obviously the turbo quiets it down a lot, but keep in mind that it is bridgeported. If my bridgeported 500HP RX-7 can be decently quiet, then there is no excuse for a stock port sub 200HP NA to be loud.

Here's a little video giving you an idea of the exhaust note:
http://www.youtube.com/watch?v=cEDp20F0R-c

is that a 20b?

As I mentioned earlier in this thread, it is a 13B.

unbolt pipe from manifold
install earplugs
proceed to go deaf after 10 minutes of driving


honestly.....why? have you ever heard these engines without some kind of muffling? i had to drive mine for a few days when my precat broke off the manifold, and it sounds absolutely ridiculous and horrible. chop the cat out, leave the OEM style mufflers, and its a nice sound with a decent sound increase without being completely embarassing and harsh.

RICE ALERT!

Slow car- check

Loud exhaust- check

I've got a racing beat header I would sell ya, 175 plus shipping if you're interested, it's used but it's still turning blue, hasn't been used much. Lemme know.

edit: Aaron Cake, THANK YOU for that link to the resonators, I've been looking for an economically priced 3" inlet/outlet resonator. Do you run just a resonator and a muffler on your car? I'm doing a HBP turbo build and I hated the sound of a straight pipe in place of the cat and all I had was a thermal exhaust muffler to quiet it down behind the stock twins and the rasp was horrible.

if thats a 13b whats with the intake.(im talking about the uim) its turbo right? or is it NA. sorry the uim looks 4 ported and im new as hell to any engine but the s4 13b NA.

Looks to be a custom manifold.

I think what he means is it is an N/A motor that has been Turbo charged. But I cannot be sure.

there are 2 parts to rx7 intake manifold, the upper intake manifold (UIM) and lower intake manifold (LIM) the upper intake manifold on most rx7's have only 4 runners, the LIM on 6 port cars then splits into 6 ports. That's as much as I can tell you. That does look like a custom UIM tho. Aaron did turbo an na motor.

As my car is a 2nd gen, it came with two mufflers out back. When I made the exhaust I maintained that. For a little while, I just had a single Vibrant 3" Ultra Quiet resonator in the midpope and it was acceptably quiet. Just this past winter I also installed a Vibrant 3" x 12" bottle style resonator in front of it to remove some slight drone at certain RPMs. It has made a huge difference and I quite enjoy the car being very quiet when cruising around. The two mufflers out back are a glass packed flow through design.

The engine is a 6 port S4 13B NA. The turbo system is custom. I used the stock lower intake manifold, and custom built an upper intake.

dude like people have said its not about how loud it is...its about how good its sounds if you go too loud you wont even beable to hear yourself think

yea today i heard this accord take off just screaming like it was racing and when i looked he was going like 20 mph.... accelerating real slow..... RICER

yeah i would just like it to be a little louder, the cat back i put on it did not even make much of a difference so i figure either getting rid of the cats and or adding headers would increase power a little while making it louder, and as for the wing i think all fc convertibles should have one.

Not of that size or style, it serves no purpose for your car. Except for decreasing your gas mileage.

how would it decrease gas mileage? its carbon fiber so weighs about 2 pounds and im pretty sure unless im going at least 100 its not going to have drag..and by that point i could use it

Stick your hand out the window at 55mph, quite a bit of drag don't ya think? And it's unnecessary at that! Just like making a car with 150hp sound like an F-18 driving 25 down the road.

Resist the rice, please.

A very crude and disrespectful suggestion.

Alright so you like your spoiler, fine. Your car, do whatever.

What I don't understand is if you hate the Honda's that are so loud driving around, why would you want to be like them? Then everyone is going to hate you too. I'm sure you don't want that.

I did say please. And ya it is my car, rotarys shoot flames with a straight pipe so i think ill do that

they shoot flames with a muffler and resonator too. They'll shoot flames with one cat on, but not too, they just shoot flames.

my na is str8 piped and before i even did the back mufflers they shot 2 inch blue domes. now they pop when i rev it to say 6-7k at idle and it blows flame domes about 5 inch around and makes a real loud pop when i let off the gas from revving it(usually the pop is when it flames) but yea its good to hear thats ok tho.

It's ok till the cops catch ya shootin flames!