I actually just ordered flowtech shorty headers and 2 spintech 9000s and you can also look up Spintech 9000s on tahoe on youtube and you can hear them on the OBS. I love the sound,but my only issue is I havent had time to drop it off at the muffler shop to get it all welded up so I cant tell you from experience, but from what Ive heard you wont regret them