hahaha....air filter, have modified to K&N drop in.
like i said...so far only extractor has been changed to 4-2-1 (hotbits)
So hor, you guys DON'T recommend that I change my exhaust piping size..rite?
Keep to the stock piping....
So for now, stop exhaust mod, ah?
bullet and etc..all dont need ...rite?