Go with the JB4. Using the CANflap option will change your exhaust sound and give you a good kick in the pants when you step on it .... with a totally stock exhaust.
The JB4 is probably the best per dollar up grade you an make to the 335I. A good set of tires cost more and have a finite life.
No matter how fast I go, there's always someone slower in front of me.
You can lead a horse to water, but you can't make him jet ski.
'08 335 E92, M-Sport, 6 sp auto w/paddle shift
JB4 PNP G5 ISO, progressive meth flash, 3" charge pipe w/dual CM5 nozzles, 60% meth injection, Oil Catch Can.
CCA Member 109065
CQ ... CQ...Kilo Charlie 3 Bravo Whiskey Zulu calling CQ