TDM713
01-09-2008, 01:52 PM
I just bought a Twin Air filter for my Honda 450r and was curious if you have to run the stock metal piece like a stock filter has inside of it? The back of the filter has a hole and was curious was it was for and im assuming it for that bracket in the airbox for that stock piece. Seems like that would restrict air flow. Any help or advice is appreciated. thanks