Hmf Exhaust

[suck my pipe]

How should I jet a 400 that is all stock motor wise except a K&N I read the directions but I would rather have someone tell me that has done it for there self. :devil

[eldoexrider01]

well we are gonna need your altitude range, and if you are gonna run with the airbox lid off or on.

[suck my pipe]

Well i'm in Pensilvania and im runing the lid on with out holes if possable cause its to dusty around here. thanks for any thing else you might know:devil