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      02-21-2013, 09:08 PM   #18
New Member

Drives: 2011 E92 M3 Jet Black
Join Date: Jun 2011
Location: sac

iTrader: (0)

Originally Posted by Azurite90M View Post
As GTM indicated, you do not need to weld and may use the clamps but you will need to cut the rear extension of your OEM primary cats to install the x-pipe or it will not fit. Welding definitely is the cleaner and (to me) aesthetically the better solution.

The drone was noticeable in the beginning. After 4k miles, the drone is still noticeable (but very seldom) at 2 -3k rpm and cold start. I have grown used to it. The Akra Slip/Challenge Street x-pipe combo is definitely one of the quieter setups out there.

I have put some thought into the ESS tune. Maybe sometime in the near future!

did you ever upload a video?