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      04-14-2012, 07:56 AM   #7
UK335er
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Drives: 335i convertible stock
Join Date: Apr 2012
Location: London, UK

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Thanks a lot for the replies guys. Now that i know other mods are not necessary i am seriously tempted.

What if any change have you experienced to fuel consumption when driving normally?

My engine is definitely the twin turbo one as it does not have twinpower written on it.

My biggest concern is voiding the warranty on the car. People say the jb4 is not detectable but are you guys sure? Would i need to remove anything physical before i went in to a dealership?

Does jb4 interfere with the stock launch control feature?