The piping then Preferably applying mandrel bends exactly where necessary and the selection of mufflers/resonators/catalytic converter/and many others.. according to the homeowners personalized choice. They're not a thing that requires modifying as Component of an engine "tune-up", and should not be used to try to overcome other problems. Gas surge: https://4age-20v-itbs15926.blogthisbiz.com/38797614/the-definitive-guide-to-toyota-4age-for-sale