I'll get a pic uploaded of the exhaust when I take the cowl off again, its a bit of a chore to do... it mimics the full scale exhaust of the j3... I cut the stock 160 pipes off short, enough remaining to flare the ends, and then silver brazed 8mm OD tubing to the stubs... the tube nuts are captured in between the flanges and where the 8mm tubes are brazed onto the stub ends... those 8mm tubes are bent under each cylinder, and then turn through the cowl, and attach through the ends of a 1" dia x 2.5" long expansion chamber... they protrude inside the chamber about 1"... the exhaust exit pipe from the expansion chamber is 10mm OD tube, that exits out of the expansion chamber from approximately the center of the bottom of the chamber (span) downwards at an angle that puts it back through the cowl on the right side of the lower corner of the cowl... then a exhaust tip made from a piece of 12mm OD tube, with the tip cut back at a 45 degree angle to mimic the heat shield/tip of the j3 exhaust... the expansion chamber has 2 straps that support the chamber back to the engine mount... all done with thin wall 304 stainless tubing.