Quote:
Originally Posted by ARC550
JB4 is preset for One setup, plug and drive. You'll easily** get 50hp/50torque
You will be at 400-430 crank Hp
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I havent been in the bmw game for a while! lol
Doesnt the jb4 require a lot more work to install and remove? (service appointments,etc). When I had my 2007 335i a long long time ago i remember a complicated install.
Any 640i n55 owners who have the jb4/jb stage 1 please tell us what you think,