well i ended up buying it for 40 bucks brand new in box. i already have hooker 4 to one with whatever size pipe 2 something to cat then stock size out this should help free up the backpressure. even if i dont end up liking the sound im only out 40.

h8p i am getting 20+ with mine too. 3.90's with 265 75 16's. people dont believe me.