Thread: Burger Tuning F90 M5 JB4 Power gains of up to 80whp and 100wtq!!
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      06-25-2018, 09:21 PM   #9
mike@x-ph.com
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Drives: 07-335/12-328/18-M4/21-M4CP
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Quote:
Originally Posted by koko f90 View Post
Wait a sec
While using jb4 the check engine lights will always be on?!
No CEL light when using the JB4 even if you use catless downpipes since you live outside of the US
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