Or a strong boost in power, the invidia down pipe offers an alternative to other power-boosting enhancements. to see just how much power the invidia down pipe can produce, a quick look at its dyno chart shows it easily added several horse-power units to the stock exhaust system. each invidia down pipe features a large 4-in stainless-steel bellmount to enhance power by freeing excess gas. it sports a one -piece design, eliminating the need for the stock catalytic converter. in addition, each invidia down pipe can be bolted up to any invidia exhaust or a stock axhaust for an easy installation.