Simon Hurrell

Hi, just wondering the best way to keep the exhaust valves open? Is it a specialist job or easy? Have googled loads but can't seem to come up with any help!! Many thanks, Simon

Celicasaur

...exhaust valves on the cylinder head, or some kind of exhaust valve like the IPE exhaust?

What are you trying to do?

Simon Hurrell

Hi mate, sorry, just trying to make the car louder, I understand there is valves/baffles in the exhaust which can be permanently opened to create a louder sound?

Celicasaur

Ahhh right, phew. That makes more sense then. I thought you meant you wanted the valves in the cylinder heads held open and I was squirming to work out why, haha.

Unless it's something about the W204 that I don't know about, I'm pretty sure that it doesn't have a stock valved exhaust. People pay grand theft money for valved aftermarket ones.

IMO your best bet will be to remove the secondary cats for more sound (leave the silencers in by the exhaust tips) or if you really want to scare small children upon cold starts, remove all of the cats. FML it becomes extremely loud though. Like...woah! I'd hate to imagine what a totally straight through exhaust system would sound like...probably horrid.

Simon Hurrell

That's great thanks, do you know if it would pass an emissions test with the secondary cat removed, or would the engine management light appear?

Celicasaur

This I'm not sure on sir (mine is an E Class with a different exhaust to yours).

I'm sure one of the W204 experts will be on hand shortly.

For their reference, are you from the USA, UK, or...?

Simon Hurrell

From the uk mate!! Really want it sounding louder bot not enough to fail it's test

Celicasaur

Ahhh awesome!

If you're from the North (ie, around the Midlands) try giving MSL a call - I hear they're excellent.
If you're from the South (ie, London-ish) then try giving Eurocharged UK a call - they've done like a million C63's.

deadfission

Wankas.

I dunno if that's an insult or not. I'm from the south.

INS1GNIA

You won't have any problems at all passing emissions test. Removing the secondary cats doesn't mess with the o2 sensor so no need to worry. No lights/codes anything will be thrown.

BLKROKT

Unless there's a visual inspection.

INS1GNIA

I just saw he was in the UK . You can always gut out the cats as well Simon. I know there are a couple of other members from the UK who have done similar to their exhaust.

Simon Hurrell

Cheers guys!! What's people's opinion on getting red of the resonator? Have seen some people think it's great and others think it sounds worse?

INS1GNIA

I wouldn't, it will add a raspyness to the sound..some like it, I think it sounds like sh*t. Start with the secondary first, if not loud enough then remove the resonator.

AMG3.2

Just to provide another point of view because that's what forums are all about -- I removed my resonator and secondary cats and replaced the resonated section with an H-pipe and have zero and I truly mean ZERO rasp.

To be completely honest, if your into sports cars or performance cars what so ever, you'll find that removing both of those components still delivers underwhelming loudness. Except for cold start - the thing is nuts at cold start lol

INS1GNIA

, it also depends if OP wants to have straights or like you said h-pipe. That would change the sound as well.

TIR

What diameter pipe did you use for the h pipe?

AMG3.2

True story - I wonder if the raspyness you've heard/described changes with straight vs. h pipe? I will admit, I've only run it with an H so cannot attest to no rasp with pure straight pipes.

INS1GNIA

I know the x/h pipe quiets & evens it out a bit compared to the straight (on higher rpm), so that could be it.