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      05-15-2012, 11:24 AM   #25
Drives: 2011 135i
Join Date: Aug 2008
Location: Germany

Posts: 614
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2011 135i  [0.00]
Originally Posted by Cousie View Post
I installed my AR Design 5" race catted downpipe last week. In combination with the BMW performance exhaust, it's kind of loud got a lot of thumbs up since I did this mod!
I'm also considering this DP and have a couple of questions.
Have you had any issues such as a rough idle or CEL?
How difficult was the install?
If you have a chance could you make a sound clip or video of the sound?
And most importantly, did you notice any performance gains?

Any other advice would be appreciated.

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