alroumi

Should I remove the stock Catalytic converters?

Is there a way of removing it, and how many catalytics are in the car ?

fredfromny

Only if you are replacing the entire exhaust system including the cats. The last turn before the muffler is very restricted. I think there are 2 cats.
Cheers

zaint10

Before I bought Kleemann muffler. I removed secondary cats + resonator and did straight pipe. The car gotten insanely louder, you could feel better exhaust flow and performance. Well, I did like the girgle and drones so I replaced mine.
If you looking for better flow and louder exhaust noise, removing cats would definitely help. Very easy job, just need welding.

alroumi

Zaint , Does it sound good ?
I dont want it to sound bad like a Camaro or an American car that makes funny noises!

silk32

zaint,

did ktr do the install for you? also did you keep the AMG tips?

zaint10

hmm.. I think straight pipe without secondary cat+resonator, the sound is just tooooo loud for a merc.
Other AMG without resonator might sound good but not for our slk. Our exhaust system doesn't have any cross overs (H-pipe, x-pipes) to eliminate drones and smoothen the sounding... so without cats+resonator.. it just gets freaking loud. I would suggest doing x-pipe. It some what help eliminates the drones and bad noises.


Silk32,

Nope, I changed to Kleemann muffler with rear diffusor painted two-toned.

SAMHATTI

by any chance who mahe a good x pipe for the slk

zaint10

I was told that Magnaflow does a pretty good x-pipe for a pretty reasonable price. Hope this helps.

98indypacer

Zaint10: When you removed the secondary cats and resonator was this with stock AMG mufflers or did you run straight pipes all the way (no rear mufflers)?

zaint10

It was with AMG stock muffler. Sounds really loud and does drone pretty bad. Not recommended. I think x-pipe works like magic.

silk32

ziant,
any pix of your setup? also did KRT do the work for you? or did a local shop?

Wallance

Hm... just wondering if the slk350 is the same? Would there be a catalytic converter that I remove and will make better sounds? Excuse my silliness if I am asking some dumb questions. Thanks

ImaHustla

Can someone give me an estimate price on how much it would cost to remove all the cats, resonator, muffelers, and do welding and straight pipes, etc, etc... Thanks.

zaint10

I did mine in Lou's Custom exhaust. They pretty good.

zaint10

I'm not too sure how 350's exhaust system is like. But for 55, removing the cats definitely help with noise and perfomance. However, you have to bare with the slight burning fuel smells. (Not noticable when driving or idle, only when you rev it up)

zaint10

I wouldnt cost you too much. A few hundredss would be enough.

SAMHATTI

but who makes a bolt up x pipe where i wouldnt have to cut anything...

Shinigami

I suppose none of this can be done without changing the look of the exhaust setup?

If I did it on mine, I'd probably lose my warranty, and the authorities would not like it one single bit due to this being such an **** country when it comes to auto-mods.

fredfromny

Removing the cats are illegal here as well. The car will not pass state inspection because of a CEL condition caused by a 'catalytic converter- efficiency below threshold fault code'.