Yes, you need back pressure... I have a set of "bullet" mufflers we use on the circle track cars that I can recomend. There baffled like a muffler but its a "blow thru" type muffler. Then again, were constantly in the high rpm's and were not shifting on the move. Deff dont straight pipe it.... I got a nice $136 ticket for noise pollution when I had mine. Plus it lost alot of power when shifting.


Sounded cool as fuck though! Lol