The pipe that gains you 9 HP will also save you 5.5 pounds in weight. This pipe is easy to install. Anyone can do it in 5 minutes. All you do is pull the springs, remove the old exhaust system, install the pipe and muffler, reattach the springs and drop the clickers. This pipe can be used with the stock muffler or any other after marker mufflers. This pipe is best in the higher altitudes.