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 , pressure tap included.Use your muffler bolts for mounting. 23.00 Free shipping in the U.S. only. PayPal or m.o.