Im going to say that $750 for just a bolt on piece is too much!! If you can make the fully plumbed vacuum box, custom TB's, and make a custom tubular runner set with the same injector placement with gains of more than 33%(the increase in price compared to the indy) over the indy then it would be worth it. If you cant make that profitable then maybe you should stick with motorcycle parts of some kind or charge $500. You will get better power out of custom runners anyways!