HMF Exhaust

[Colt Gibson]

I was looking to purchase a HMF S/O exhaust, the question is which one to go with? i have a stock 05 400ex, looking to get a good throttle response, and power all around bottom to top-end. any kind of info will help, thanks.

[oldskoolex400]

sport series cuz its the cheapest

if you want to get a fancy one get the carbon fiber ballance ed.