Overspooled

Hey guys, looking to go straight pipe on second cats and resonators. I've searched a lot about this and wanted to know if it's overly loud at idle or while cruising. Is between 100$ and 200$ ok? If anyone has a youtube link that has exactly second cat delete and res delete with straights can someone post it? I seem to always find with either xpipe or no res delete. thanks

dubzAMG

leave the resonator, remove the secondary cats, search there is a thread "power pipe"

Rib Feast

I used to have an unresonated Milltek RS4 (B7 v8) and moved to a MY2012 C63. I found WOT in the C63 great, but still was missing something.

So I removed the 2ndary cats and put in a x-pipe, and it greatly improved volume and anger levels of the car. But it still was missing something...

So I then went back and removed the resonators, now it backfires on downshift and is much more menacing. When driving under 3K RPM it's perhaps 10-20% louder in a midrange tone. I've never had anyone comment on the noise levels or about there being any drone. The RS4 had insane droning at 1800-1900rpm though.

Personally I say get the x-pipe and 2ndary cats pulled. Drive around and if you still aren't happy then take out the resonators (cost me about $80USD). I don't regret it, it makes the car sound furious.

Rib Feast

Here's an outside vid, there's some wind noise but you get an idea on how it sounds. 50 secs on vid 1 is a good place to start...

OH_NAH

How many cats and resonators do the c63 have in total starting from the headers onwards?

Jason Anthony

X pipe ruins the car sound. Don't do it. If leaving stock primary cats, go straight pipe for resonator and h pipe for secondary cat delete. Mike's power pipe is a great h.

The mufflers on these cars are designed to be really loud to make up for all the restriction.....

avery.whss

it's loud for like a week then you're like "I want more" i have straight 2nd delete and i still find it quite..until i go around back then my ears bleed damn you MB why'd you put so much sound dampering material in these cars

E=mC63

This is my 2012 C63 (non pp). Just like what Jason Anthony said,
I got Mike's Power Pipe H Pipe for my secondary cat delete
and a straight pipe for my resonator delete.




And a cold start:

OH_NAH

^ that sounds whicked!! Do you have a photo of the exhaust setup on a hoist?

E=mC63

I tried taking a picture, but the exhaust shop wouldn't let for legal reasons

MikeTc63

Today I removed both secondary cat and resonator with straight pipes ..

Watched some videos before I did it But never actually heard a straight piped c63 in person...

ITS REALLY LOUD !!

I love it right now , but kinda scared that it might be a "Bit" much lol

avery.whss

in 2 weeks you'll be thinking it's too quite

BiturboSF

Did anybody ever thought about recycling there cats? I have no use for mine & don't plan on putting them back on. My secondary cats are just sitting in a box in my trunk, I was going to throw them away but figured I might get some money back since people go around cutting peoples cats for $$ around here...has anybody tried?

gaspam

just get longtube headers and delete all cats and call it a day

CarHopper

Here is mine. OEM headers into secondary cat + res delete into stock mufflers. I didn't rev beyond 2-2.5k because neighbors were around.

It is actually a little quiet for my taste. It isn't in your face loud until you really get on it. Then it opens up as you would expect.

OH_NAH

Are there 4 cats in total? So normally you guys would just remove the 2 towards the rear and remove resonators right? And leave the 2 cats at the front as is? Is there any resonators in the front near the headers? I don't own one yet so idunno what it looks like under there.

gaspam

2 primary cats>2 secondary cats> resonator> 2 mufflers

OH_NAH

Sweet, and do the long tube headers normally come with CAT or nah?

Mort

LTH usually come without cats but 200 cell (or whatever you choose) race cats can be added. My MBH headers have cats in the mids and an x-pipe where the secondary cats where originally located.

c63piloti

I'm currently running Mike's power pipe (h pipe, love it btw), and am hoping that someone out there offers a resonator delete, before I go to the effort of having something custom made. Thanks guys.

Manofsteelpt

Sounds mean bro, love it! do you think I could expect the same sound for my 09 CLS63 if I remove the res and straight pipe it? This is what I've been planning on doing soon as the weather breaks a lil more.
Btw, I'm your neighbor out in Buffalo.

CarHopper

I'm not sure if the sound will be exactly the same. You might have different mufflers as well? I'm not too up to speed on the CLS63... For emissions, keep the primary cats, delete secondary and res and run that into your stock mufflers and I'm sure it will sound pretty mean.

I'm probably going to get a set of long tube headers though to make it louder and then just tune it so I can pass NYS emissions.