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      08-18-2022, 02:18 PM   #64
corbs09
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Drives: 09 335i
Join Date: Jul 2013
Location: Dallas

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Quote:
Originally Posted by FSociety View Post
Yep JB4's run lean and mean, horrible for the car in every way!!!

Imagine throwing all this extra boost now the car runs HOTTER (more boost) and AFR lean (bad for engine ). Expect shorter spark plugs life, blown out o2 sensors etc.
Its weird because people have been running JB4s for 10+ years now without much issue if you keep it simple.
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