Add excitement to your 930 with our wastegate boost springs. The acceleration is phenomenal, and you have the peace of mind knowing you can't inadvertently turn a dial too far and fry your engine. Choose two levels of boost: from 1.0 bar (20% over stock) or 1.2 bar (33% over stock). 1.0 bar is best for most street driven turbos, while the 1.2 bar spring is recommended for cars with larger (aftermarket) intercoolers or fuel enrichment devices.