Quote:
Originally Posted by berk
Never get the racechip ultimate! My friend bought one and we have tried all settings and compare with my stock 428i. Result is nothing changed! They clearly fool people! Racechip increase power and torque at low and mid rpms. It works until 5k rpm after 5k it turn back to stock! Which is suck!! When you go WOT rpm stays 5.5k to 6k so racechip wont change anything!
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I have dyno of before and after and can tell you that it makes difference.
BMS Stage1, RC, and JB4 all makes more power (and very usable torque).
I you have an Adroid phone you can install torque pro app and ODB2 bluetooth reader to test it.