Does anyone know the difference between the Vance and Hines ovals and monster ovals? How is the sound and is it worth the $. This may also be a poll question for the forum. Also ( I am sorry if I ask alot of questions but I like to do my homework) the Rush exhaust have baffles that I can chose. Will the smaller diameter baffles( 1.50) help with backpressure from the true duals and is the sound deep or obnoxious.