[camt]

hey i recently got 21/2 inch all the way through and a high flow muffler , after i had an LPG explosion and it blew up my muffler and some more!!!! scarey !. after this it seems i ve lost about 10 per cent of power and turned it into noise .. which is cool but i want my power back !! . i ve also got banks headers too.. i asked a mechanical engineer and a regular down the road mechanic, the same question " does a 4 stoke need back pressure " the mechanic said no only 2 stokes do, and the uni grad engineer said yes both 2 and 4 stokes need back pressure,, the engineer is right ..