Quote:
Originally Posted by DarylKZ4-30
I have been trying to identify Horsepower performance kits for my 2009 Z4 sDrive3.0i, but also wondering if items like the GForce Performance kit really achieves what it advertises - 60hp, 3-7mpg and 30ft-lbs torque increases ....? Does anyone have any experience with these types of kits, whats the best and any effects on warranty ...? --- Daryl
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nope this is all hot air
for a safe bet look into the AA tune, OE, Eurocharged. Others include BMS, Evolve, racing dynamics(RDsport in USA)