would i have to have new exhaust

[PowerJunkie]

can i run a high compression piston, jet kit, maybe port and polish with stock exhaust?

[LT250RMan]

yes you can, but you will get more power and probaly a cleaner burn with a aftermarket exaust

[400exrida06]

Ya you'd notice a bigger difference if you had an aftermarket pipe.

[exrider008]

i would say get a pipe because u wont see much power out of ur engine with a stock pipe.
i would get an HMF full!!!