Yamaha kt100 pipes?

Hi . Have a vintage 1974 margay kart. With kt 100 . Put a RLV. L-2 pipe on it and love the power band. Only problem is the way it fits the kart. Sticks way to far out the back past rear bumper. Found a RLV vintage pro 81/82 pipe. Hartman copy. Had a very beat up Hartman pipe on before and it fit great. My question is does anybody have experience with this pipe? As far as performance on a KT100? It is shaped exactly the same and fits the kart well. Thanks Paul