Mighty Car Mods show you a variety of sound comparisons of the full 3 inch exhuast, with Varex Muffler by X-Force on their S15. There is a complete install which is part of Season 02 Episode 04 which can be found here: http://www.youtube.com/watchv=Ay_p6qUSYJE
For more info on Varex click “Varex” button in the main menu bar.
