Had a friend ask me to make him an adapter for his 1998 Yamaha Banshee 350 with the stock OEM airbox, he wants to ride it this weekend and internet parts won't get here for a while. It allows for an aftermarket K&N air filter, 4 inch ID instead of the cheap OEM plastic cone with glued foam. We will use gasket maker to seal the box. He also says the oval model fits better than some of the aluminum adapters sold on the internet.

Only differences is the oval into a circle to better clamp the K&N air filter.

I printed them in ASA and have not tested them whatsoever.