Finally decided to mod my stock muffler i cant see spending $400 for a slip on for 3-5 hp gain. So i cut off the stock outlet welded it closed and opened the rear with a 1 7/8 3" long exhaust pipe, Wow it sounds great throttle response is much improved but feels like i lost some bottom end in low gear doesnt take much to hit the rev limiter. High gear feels like it it lost a little pickup. So i think i need to close it up a little to get some more back pressure. Stock pipe inside was 1 3/4 (entering the muffler) so il try that size reducer and then a 1 1/2 size and see which one feels better, and il go smaller if it doesnt feel better stock outlet was 1 1/8 I can just screw them on the end for testing and then weld it on. il get them on this week and let everyone know for any one who wants to try this.