Bisson Pitts muffler for a .46 side mounted engine. 38 mm bolt hole centers fits .46 OS, thunder tiger, magnum. Mega tech and others with this b.h.c. Tubes are 1 long however can be extended with the silicone tube that comes with it. Not rubber tubing but high heat silicone type .Use your muffler bolts for mounting. 23.00 Free shipping in the U.S. only. PayPal or m.o.