and it's loud as fuck...... 6-3-2 Hooker Header Super Competition header....and twice pipes back (duel pipes mandrel bent).... 2" per pipes, with two mini-cheery bombs on each pipe. 4 bombs 108db's at the least.....going to be fun not to get pulled over now. (2" pipes x 2 = 6.38"-ish exhaust.... if my math is right.) revs stupid fast....breaths better than an opera singer in a room of fresh oxygen. Still got a few kinks to work out...but it's the sickest exhaust for the N/A Z ever made.