Since He's making it totaly customizable for the buyer, if loud and performance is what you want, go for straight pipes at all junctures. I think this is a great idea because even if the whole system is a lil expensive, people can buy in pieces till they get the whole thing, then install. Plus the fact that nobody can complain about a feature not present as they would be able to basically build it to their liking. Smart move Needswings, and go with the better flange.