I wanted to know what is the difference between the OEM Z-tube and the Stillen Z-tube. A new Stillen tube is about the price of a used OEM tube. Thanks.

 

There are 2 end pieces off the stock tube, one bent and one accordion-like, that you have to attach to each end of the Stillen to make it fit. Basically, it goes airbox, accordion piece, Stillen tube, bent piece, throttle body. The OEM Z-Tube doesn't require either of these pieces, so it's airbox, OEM Z-Tube, throttle body. The functional differences are microscopic, and probably not measureable, but for the same money get the OEM tube. It's not like it will ever wear out, so getting used doesn't mean anything.