No Joew, only some motor kits offer the 2 piece Bi-Turbo JUNK. Only because of the special exhaust port angle. The regular Bi-Junks are one piece with removable silencer can(stinger?), with replaceable insulation in the can. But yeah, you are right on the 2 piece ones. That extra pipe in the ex. chamber would kill any sign(s) of gain.