solekeeper

Before everyone jumps the gun, i did do some research.

C63 arrives tommorow and wanted to clarify a few things. I want to straight pipe, and this thread helped ALOT.

https://mbworld.org/forums/c63-amg-w...info-noob.html


Now my question is, if i cut out the secondary cats and replace them with stainless steel pipes, will the car sound like this?


This may or may not be a dumb question, but is this technically considered a "straight pipe"?

And also, can this mod be easily put back to stock when ready to sell?

This is all i want to do, i want to keep it as simple as possible.

ToXicXxX

My C63 had long tube headers straight catless midpipes, OEM res and mufflers... And HOL-E-CRAP was it loud. So loud in-fact that I was forced to sell it.

solekeeper

jesus christ dude. you could wake up the dead.

you provided nothing in terms of my thread though. lol

I'm not interested in headers or any other jazz. want to keep things simple.

ToXicXxX

You're gonna be similar levels of loud removing everything but primary cats. That was my point, haha.

solekeeper

all i want to do is remove secondary cats, and put pipes. still that loud?

ToXicXxX

Won't be too insane.

papashango

I noticed you pm'ed me about my thread and just to answer your question, I didn't end up doing anything yet. Just the worries of voiding the warranty stopped me. I even contemplated doing an electric cutout which to be honest sounds like a better idea to me, but I refrained from going that route for the same reasons. Guess I'll live with the stock exhaust note for now. Lol.

solekeeper

cool. i hope someone can chime in with that video i posted. i think that car sounds good.

solekeeper

you disspoint me

ToXicXxX

Exhaust work shouldn't void power-train warranty, just exhaust warranty. I have test pipes on my bimmer and BMW had no issue doing warranty work on my transmission on Monday. It's all how you know your SA or how you talk to them.

Phorte

videos are very subjective because you can't tell how it sounds compared to idle and also taking into account environmentals etc.

but my car doesn't sound far from that video and all i have is mike's H power-pipe to replace the 2nd'ary cats, and a straight pipe delete to replace the resonator.

however, i can't tell if it's louder than the one in that video...

papashango

Maybe I will change my mind randomly. You should look into electric cut outs. Sounds like a good way to go and have the best of both worlds (stock sound and aftermarket roar).

Already having issues with your M3? Uh oh...

Kriston

Resonator delete sounds wonderful.

I straight piped the resonators, but i warn you. After some time you may want to delete the secondary cats as well. The resonator makes a great improvement in the cars exhaust note. You will hear gurgles and pops on over-runs.

You can see a more detailed explanation with pictures here https://mbworld.org/forums/c63-amg-w...ot-me-bad.html

johnny--2k

That first video is my car. And yes, your car will sound like that with just a secondary cat delete, replaced with straight pipes. Here are some pics of that setup from when it was done...


Here is the BEFORE:




and here is AFTER:

johnny--2k

And here is a cold start with that setup...

Kriston

Johnny those welds look scary man. yikes.

Djmouz63

+1 I got no cats no res only muffler with lth and its amazing but before had removed res and 2nd cats which also sounded great but not quite enough for me haha.

MichaelMax1

I deleted my second cat , replaced it with an X pipe and also I replaced resonators with straight pipes. Here is what is sounds like

johnny--2k

LOL, how so? I didn't do it but a fellow member here with a shop did. I think the pic makes it look horrible, I saw them as it was being put back on the car and they are actually pretty clean. They polished them and ground them down before reinstalling.

Function over form i suppose...

solekeeper

johnny thanks so much for your reply. that cold start sounded nice.

would you happen to have a vid of you driving?

car just came in today, stock sound isn't too bad.

johnny--2k

Unfortunately I dont. I can try to get one this weekend. I'm out of town until tomorrow.

akmatic63

+1. Same set up I have (until my headers are installed and my primary cats are deleted). As far as going back to stock, idk. You will definitely hear it at cold starts and WOT, but at normal casual driving nothing crazy.

Kriston

Perhaps its the angle of the pic, just ensure the welds are seamless. If the pipe aren't stainless steel, any gaps on the welds lead to quicker oxidation / rusting. We don't want any exhaust leaks either.

johnny--2k

Ah, yes it is the angle. I looked them over and they are actually really well done. Also, they used some anti-oxidation spray that was bright silver as well, so it looks like its messy, but that was just the spray.

Here is another angle:

solekeeper

johnny what kind of pipes did you use exactly?

i hear stainless steel is the best, what guage? if you can get that moving clip for me, that was awesome.