Lol no, the R's are no slouch. It's gonna feel slow until you get the head ported, it's just a thing of the R's. Our group has 2 with basically the same mods, but one with ported head and it's head and shoulders above the other. I guess they're just like shee's, porting really wakes them up. Check out Racers Edge, they're gettin alot of the work for the R's right now and makin 'em run hard.