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      12-24-2012, 11:51 PM   #5
I35it
all day
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Drives: 2012 135i
Join Date: Jul 2012
Location: San Antonio, TX

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2009 VW GTI  [0.00]
2012 135i  [0.00]
I would assume its for the lack of wastegate control with no cats where you could over boost. I tune Mazdaspeeds and I know that if you don't run the right maps with them the car loves to overboost and just run havoc. But theres a shit load of other reasons not to run the carless without the map because of fuel issues, timing, and shit whatever else.