The guy tipped me off how to make these and where to get the parts from and since i have worked as a cnc machinist i know how important attention to detail is so I will be making a thermal intake/exhaust manifold spacer for myself and any others who are interested after results and testing. The spacer will be for a 78 280z with round ports and as much as i would like to do dyno comparison of stock vs stock w/spacer im not because when i remove the exhaust manifold a 3-2-1 header will replace it. So dyno testing will be futile when trying to find the direct effect of the spacer itself. But i will do a dyno test showing the gains of a 3-2-1 header plus exhaust and spacer vs stock. But the main test will be focusing mainly on intake temperatures. So i will be back in a few weeks to share the info.