If this guy knew anything about Vance & Hines he would know that building, tuning, and testing for the best flow and horsepower gain without damaging the engine is what the company does best. What this guy does best is up for grabs but he definitely doesn't have a clue as to what he is talking about and he will probably buy some POS exhaust that will not produce anything for his engine that is good and get rid of the one that would have benefited his ride.....