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      02-12-2013, 07:20 PM   #122

Drives: 2013 335 M Sport
Join Date: Jan 2013
Location: Bergen County

iTrader: (1)

I purchased my challenge catless DP about 2 weeks ago. It took a couple days for my CEL to come on. Sounds awesome and gets slightly noticeable more power. I am at the time running stock exhaust though waiting on the challenge exhaust. Best 500 I've put into my car so far. Fitment was flawless, nothing but compliments on the sound even though the stock exhaust is rather restricting. I unplugged the exhaust valve while doing this install too so that both tips are always open (you must unplug after the valve is already open). Will post sound clips soon