Yes you can go too far and knock all the geometry out of whack and have a cock roach in 60ft. Several things can attribute to this, everybody wants a big ole road runner but forgets about H/P and rpms.
Rule of thumb is if gains good on realitive stock motor as in 8mph and 4/10s in 300ft it will definitly do that with a strong engine or better.
They have to be measured out before machining begins and crack checked and have a (good core) for a fast long lasting piece.
Our units take some time to do, any does for that matter. Any thing you can do to make it work slicker is a + ..JH