In 1974, a completely new course of action was used to harden the rotor housing. The Sheet-metal Insert System (SIP) applied a sheet of steel very like a conventional piston engine cylinder liner which has a chrome plated surface. S3 engine for sale Turbo audi engine s5 twincharger supercharger build https://13brewmotorforsale35432.blogproducer.com/36481517/the-smart-trick-of-jdm-mazda-engine-that-nobody-is-discussing