I'm going with a custom tube upper that is made of 3.5 inch aluminum elbow, this will bolt to my stock lower that is knife edged and ported and polished. Granted that this intake works well i will be selling my old upper intake that is totaly welded up and square instead of the valleys and gutted, and also fitted to work with a 65mm TB. The lower intake is pretty easy to remove, 8 bolts and the fuel rail etc. Just make sure to take out most of the coolent so you dont spill into the cyls when you pull off the intake. If you need some help drop me a line.