Hello all. Kind of new to the race mower world. We have a small race circuit that my son races in with tight twisty tracks. He recently grenaded his 19hp briggs single and we are in the process of installing a 22hp twin. My question is on the exhaust it seems like I've seen for purchase a exhaust pipe/muffler for these twins on a web site some where but can't seem to locate it if anyone knows I would greatly appreciate it.