thanks for the tips, ya california does have decible limits, put hey i ran the van good and loud anyways, the pipes are about2 maybe 2 and 1/4 and my van screams, my dad thought i was nuts and dumb when i told him i wanted bigger pipes ha it was pretty damn funny. with my setup, headers and just pipes, how much power do u guys think it adds to the engine? they are regular sized headers. also, whats the difference on shorty and long headers? which adds more torque or power and why? thanks