winner007

I have a eg civic with a K20a2. My exhaust system is a 2.5 inch with Cat and vibrant exhaust. I know the vibrant exhaust is kind of loud. when i brought the car it came with it. Now i want to change it to a quiet 1, but i don't want to lose performance. What are the suggestions that i can buy? I'm a mechanic myself so i know what i am doing, but i just want some advice. Hopefully someone with knowledge can help. I asked the exhaust places and they said put a resonator on. I don't think that will quiet down a lot. I just don't want any cops pulling me over. If i put a RSX OEM muffler would that lose just 1-2hp? Some people say remus exhaust. What other route can i go? I want as quiet as possible or at least street legal with no cop attention.

MPR

If it doesn't have a resonator already, put one on and try that. It will make a big difference.

I say it all the time, a good quality resonator will help make a good sounding exhaust system.

If you find it's still too loud, try a different muffler.

What type of muffler is on it now? Flow through or baffled?

I'm using a modded cherry bomb turbo muffler which has lots of baffles inside and is quite quiet to begin with yet it's 2.5", and still flows quite well. I haven't really noticed any drop in performance, but infact maybe a slight increase in mid-range torque, if anything.

Something I've learned is on a daily driver, not to worry about the extra 1hp gained from a loud exhaust, instead, make it comfortable to drive. Your ears with thank you. lol

F8i

iTrader: (10)

doesn't happen often, but I couldn't agree more with MPR on this one.
A resinator is $90'ish, and will make a huge difference. Also, if it's a canister muffler, after getting a resinator, try buying a silencer for it.

I enjoy the sound of the Si exhaust, so maybe switching to the RSX Type-S muffler (assuming there's a difference in models) wouldn't be a bad idea. Research how restricting it is, or do the opposite and see how much power your current muffler adds, and see if it's a loss you're willing to take. A friend of mine uses a SiR muffler on his D series, sounds terrible IMO, but he's happy with it, and it's not loud.

Peter Mackenzy's (sp?) rally car is using the Cherry Bombz Glass back, and it does sound good!
-B

raman

I used a rsx type s muffler on my civic. 2000 si d series. With no resonator and straight 2.5. Factory cat.. sounded really nice and smooth. Very nice to dd with.

D.T.P

As mentioned above, add a resonator.
Also something to keep in mind is you want a bit of back pressure. Its N/A so back pressure will actually help with low-mid torque.
Now the 1-2hp you are worried about, loose 5lbs and the difference will be covered

MPR

HAHA! So true!

subsonic-civic

iTrader: (2)

I have a Brullen, it has a great tone, and it's a tad bit on the loud side. Remus has a very similiar tone, but are much louder. Too bad brullen is no longer i will cry if mine ever breaks cause i'd never be able to get another!!!!

winner007

Thanx for the reply. I called vibrant and they said they don't sell silencer for 2.5". I guess i will try the resonator. Which resonator is best? Are the cherry 1's any good?

MPR

Cherry bomb brand doesn't make resonators. (glass pack is not a resonator and is made of cheap/low quality materials, hence the cheap cost)

I recommend magnaflow stainless round resonators. Excellent quality and I got mine for abour $100.

winner007

So my final decision after my research is done.
I would go with the Ultra Quiet Resonator or the magnaflow 12640 27".
Which 1 would be more quiet? The more quiet the better for me because i will use it for street use too.
Anyone try these before?

FlashEngineer

I'm not too sure about this but I think the muffler itself won't make much of a difference if you get a quieter one. At least for turbo Subaru's the whole catback doesn't affect much performance, only the downpipe or header for the Civics.