1st Gen R53 Cooper S Most liked posts in thread: Exhaust opinions

I believe that other than the JCW exhaust with the resonator removed, the Miltek sounds the best. It gives a throaty sound that doesn't sound like a ricer fart can.

 

Cat shmat.... The world was screwed long before I came into it... Why should I be the one to try and clean it up?

 

I agree with the above advice from CHKMINI. I've done the JCW w/o resonator an am very satisfied. It's also an exhaust I will never have to worry about each time I go to the smog station.

 

JCW is stainless steel, even the tips.

 

Even stainless rusts and corrodes on an exhaust, it doesn't happen near as fast or bad, but it does happen.

Yes the JCW is all stainless, plus its all factory so the quality is better than most aftermarket options.

If you are going to be running catless, you know that you will pop codes left and right... Even occasionally go into limp.

 

Take Marks advice ^^^ his car sounds great.

 

I bought the Invidia N1 a few months ago and would suggest you take a look & listen. It's louder than stock without shouting "LOOK AT ME", and it has a deep tone that really accentuates the pop & burble. No cabin drone at all. The Invidia is also significantly less expensive than Miltek or Stratmosphere.

 

Race header, Race cat, couple of small easily blown out resonators. Be Loud, Be Proud!

 

Ive got a custom rmw exhaust and it's awesome loud when you want it and really deep sounding

 

Race Cat, High Flow Cat, same thing...

I was trying to be sorta funny with my post. What I wrote is what I have and it can be LOUD.

Most race cars now have cats on them.I know that WRC are required to have them. The FIA requires them ion many series too.

 

Check for exhaust leaks first.
Next find someone like Helix that can clear the adaptive's with the Bav tech scan tool they have. I think, but am not 100% sure that code may be a hard code and must be cleared with a BMW tool like the Bav-Tech tool. A Pep-Boys scanner will not work and I know this for a fact.

To get rid of it you have to clear the adaptive's and the take the car out for run at speed (45-50 Mph) for like 20 or 30 min on the road. The PA Turnpike is great for this.

Then take it back and have it tested again while the CAT is warmed up and you should pass PA emissions.

 

My mini failed emissions testing. Now I have to fix it even though I could have just registered it in another county before getting it tested. Oh well. Need advice. I replaced the O2 sensor in case that was the problem. No dice. Light for service is back within 30 miles. The installed cat has a bolt in cat attached to the manifold. All I can find with parts is the whole assembly. I don't think it's a stock cat assembly but don't know. (1) Where can I get just the cat? Should I also change the PCV Valve at the same time? It's code P0142, I believe. Advice appreciated.

 

My mini failed emissions testing. Now I have to fix it even though I could have just registered it in another county before getting it tested. Oh well. Need advice. I replaced the O2 sensor in case that was the problem. No dice. Light for service is back within 30 miles. The installed cat has a bolt in cat attached to the manifold. All I can find with parts is the whole assembly. I don't think it's a stock cat assembly but don't know. (1) Where can I get just the cat? Should I also change the PCV Valve at the same time? It's code
P0420, I believe. Advice appreciated.

Sorry for the dup. I realized I mixed the code and should have just edited the first post.