pointman

thinking about having mine hollowed out. Res. delete is nice, but a very very subtle change. Would like some more burble and start up boom. I fear it sounding civic'ish.

MBNiko

When a 5.4 AMG V8 sounds civic'ish with removed cats, that's the day I move on from AMG. Delete the secondary cats... You wont regret anything. No CEL lights, no drawbacks, just a better sound.

lukespilner

I like when my car makes a lot of noise.

Vitor'sIphone

Considering the change will be subtle, is it worth the hassle ?

I mean the last thing you'd want to do is devote a lot of time an energy to something and then realize that you don't really want it.

lukespilner

Pointman may be committed to sticking with the car for a decade and then claim that the engine died on it.

Vitor'sIphone

That kind of demeanor might make some people angry ..

ghiaguy

I don't regret removing secondaries at all. That being said, I may regret the day I was born come smog time...

MBNiko

Oh California....

Here in Indiana I run completely catless with headers and a Ecu tune/Speedriven tinkering made me pass my emissions testing with no problems

ghiaguy

Lucky!!! I have family in Plainfield, IN, they rub the easy/non-existent emissions rules in all the time. If I lived there I would have headers in a second!!

91RS

Throw the whole thing away and put on some long tubes! The secondaries and resonator removed wasn't loud enough for me.

fatboy03

I'm taking mine in Friday morning to have the res delete. After reading this,I may have the secondary cats taking off as well. My muffler guy said something about putting cherry bombs on it. Wtf
Wonder how loud that would be? LOL

maverik259

you will pass smog without 2nd cats. I did and I live outside LA. The primaries do just fine for smog tests.

fatboy03

Couple questions before I pull the trigger..Did you guys just run straight pipes in place of the cats and leave the oem mufflers alone? How loud us it in the cabin?

C230 Mulac

I haven't done this to my C55 yet, but I knew someone who did and I heard it from outside as well as drove the car. Removal of resonator and secondary cats and it sounded PERFECT. Had a nice loud rumble, but also sounded very nice and wasn't obnoxious at all. I'm going to have my secondary cats and res removed sometime next month

There is a small amount of cabin drone, but if you want to do anything that is worth it to your exhaust, you're going to have to accept that. However, I personally like the sound because it's not really too loud and annoying and it makes your car sound good.

I don't have to worry about emissions where my car is registered in VA (not req'd) so can't shed any light on that part.

ghiaguy

Highly recommended. There is very little drone and the car sounds fantastic

ghiaguy

music to my ears. After I pass I am going to treat myself with dual exhaust w/ an x-pipe. ..
Who can comment on the experience going from simple deleted resonator/secondaries stock Y pipe to a true duals with x-pipe? Is it worth it?

C230 Mulac

When you say "true duals" don't you mean without an x-pipe and just a single separate pipe from each header back to each muffler and they never connect into one? I thought that's what "true dual" was...maybe I'm just being stupid

fatboy03

I would think true duals would be WITHOUT the X pipe.

ghiaguy

Just to denote from stock dual exhaust outlet- I would consider anything replacing the stock Y pipe section with two individual pipes true duals. I never thought of an x-pipe for exhaust bank harmony (and greater performance) as cancelling out the dual exhaust, but technically I suppose they are no longer fully independent.

Enigma94

Just because there's an X pipe in there doesnt take away from it being a true dual exhaust. Most high performance cars with dual exhaust have X pipes for the very reason you specified.


I've wondered if anybody has left the resonator and the secondary cats in and removed the mufflers and gone with straight pipes?

Probably would equate to too much drone but i've been thinking about doing it. I'll probably end up just doing the resonator and secondary cat deletes.

scrwmpwr

Theres a member who removed mufflers and is running j pipes I think his name is arekux

ghiaguy

Yesss... so badass
https://mbworld.org/forums/c32-amg-c...haust-mod.html

Saaboteur

QFT. My car came with the resonator and secondaries already deleted. But I can provide a fair comparison because my old C43 still had both. I was on the fence about the delete, fearing it would be too loud. But honestly, the first time I test drove the C55 I ended up buy, I didn't even notice.

Back in June, we went on a 1000km+ road trip (documented here: https://mbworld.org/forums/c32-amg-c...road-trip.html) and neither my wife, nor our then 1 year old baby girl complained at all.

On another 55 car, I would do it again in a heartbeat. Mind you, we don't test emissions here, so that's not really a concern for me. If I was concerned about the environment, I wouldn't have two V8s in the garage....

fatboy03

I'm having it done tomorrow. Hopefully I won't be disappointed. I've always had exhausts on pretty much everything I've owned but getting to the age now where I don't want it to be too loud...LOL

Saaboteur,
Is the noise very loud just cruising around town & on the highway? I put most of my miles back and forth to work. 15 miles round trip. But do go on alot of Dragon Tail runs, long weekends, ect.

Pedro_MD

Ive been thinking of removing those secondary cats; but I allready have Kleemann Headers/Primary Cats del/Resonator Delete. The sound is Awesome as is. I'm guessing taking out the secondaries will just make everything louder???