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      01-15-2013, 07:57 AM   #11
pbonsalb
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Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

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Quote:
Originally Posted by btgM3 View Post

Dinan: This would obviously be compatible with the muffler, but price and need for flash are making me think otherwise.

Challenge Street: Price is great and no need for tune.

My preference it to not do any cutting or welding. Does anyone know for sure??

All comments and suggestions are apreciated!
There is no "need" for a tune with any x-pipe. You will get a CEL if you delete the primary (front) cats. This can be fixed with a $1000 tune, with a $400 Akra Delete-R or with a $95 BMS Downpipe Fix.

Any x-pipe that is not a complete x-pipe and retains part of the factory x-pipe will obviously require cutting your stock x-pipe. Study pictures of stock and aftermarket x-pipes until you know what you are buying. Some incomplete x-pipes delete the secondary (rear) cats only, which does the least for performance because the primary cats are the most restrictive and add the most backpressure to the exhaust.