I used to work on quite a few z31s, but now the few that still show up are usually too broke to pay for more than an oil change or a tune up. Ill let this go cheap, since i dont mess with em much anymore. Im only asking $60 SHIPPED!! This is half of what they used to go for on ebay when you could actually find them. Its 10mm larger than stock, and bolts right on to a stock intake manifold on vg30et and vg30e z31 motors. It even has the cruise control cable pulley, so you can keep your cruise control. This upgrade makes a very noticable difference on the turbo cars. I need the money for other parts, so Im selling it cheap enough to hopefully sell it quick.