I was just wonderin what would happen if you put a 2-stroke pipe on a 4-stroke? Like a 2-stroke pipe on a Warrior.

 

Wont happen

 

I've never seen it done, and that's probably for good reason. My guess ( I said guess! ) is that the exhaust pulses would do okay until pressure got past the expansion chamber. The skinny part of the exhaust would have give it too much backpressure, and maybe, stall the vehicle, or blow a gasket, or something.
I have no idea what would happen for sure, but alot of research goes into performance pipes to match them to their applications.