Just got me a new wife, so car spending has to be done discretely. I want to try the kit on my M3 AND the M5. I hear that a stock E30 M3 with Split Second AMM kit will pull on big-money E30 M3's with 2.5L engines. It increases torque and HP along the entire rev range, especially down low where the M3 needs it the most. Others with SS kits on their M5s say that it's an amazing difference. Imagine trying to suck 280HP worthof air through that crappy AFM!! Air is directly proportional to Power.