I just put my Yoshi Full System (comp) on my predator and we put the same system on our DVX. Before we did either pipe, I'd beat my wife in a drag race by a few quad lengths, now she walks on me!!! My quad is running good, not popping or anything and hers is running good too. The pipe made a HUGE difference on the DVX and I can barely feel a difference at all on my preddy. The directions recommend that you drop your needle clip 2 spots on the predator and they recommend a main jet switch for the DVX. We haven't done either yet so I figured my Preddy would be a lot closer than the DVX would be on jetting. WHY AM I LOSING TO A DVX IN A DRAG RACE????????????? Does 2 positions on a needle clip make that big of a difference, when we didn't even change the main jet on the DVX????? Help!!!!!