Exhaust shop duals. Not too bad but...... H pipe is pretty delux there. My Swinger has the original single exhaust on one side and the Y pipe split to duals. The mufflers were rotted when I got it and the guy that put the new ones on had a heck of a time finding good metal to weld onto to. No photos. I have a pair of 340 manifolds and I will probably put on a TTI dual set up.