well its really hard to explain w/o a pic...
bit motor = exhaust can
-take all internals and cap off
antenna piece cut from bit controller = exhaust tip
(or really anything you can find metal to be a tip)
-glue this to the backside of the motor
staple or paperclip = exhaust hanger
-sand down an area of the motor and also the clip so sodder will stick
-bend as necesary (make a small hook at the end so you can attach under a bumper screw)
-find a correct sized washer (on the skyline i attached this to the center rear bumper screw)
ofcourse youre gonna have to keep rebending so you can get the exhaust to stick out right. you can even angle it outward for that oh so cool jdm style straight pipe look
if i can get a hand of my friends digi ill post pics