BMW F10 535i Rev9 Downpipe For B55 3.0T Activehybrid 5 Series. Available at megamotorsports.pk. Increase the performance of your BMW F10 535i Rev9 with our downpipe designed specifically for the B55 3.0T Activehybrid 5 Series. This high-quality downpipe is expertly crafted to maximize exhaust flow, resulting in improved horsepower and torque. Upgrade your driving experience with our Rev9 downpipe.