Quote:
Originally Posted by onfireX5
Racechip = easy install, SUPER Quality and easily knocks 0.80 seconds off your 0-100mph time.
JB4 = Will add more average and peak power and go faster than RaceChip if you want to push boost and parts.
Define your goals and have fun with either one.
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I had the JB4 on a 335 in the past and it worked wonders. For the X5M, I already have the Eisenmann exhaust but I plan on leaving everything else stock.
Only concern is finding a dealer in north NJ that is mod friendly so I don't have to remove it each time I bring it to the dealer.
I'm leaning towards the JB4.