At some point, I am looking to ditch the factory manifold. This is on a built 1UZ VVTi with a large turbo in a light car (2600-2700lbs). I really am not concerned about low RPM performance. I would like the new manifold to be lighter and suffer less from heat soak. My new manifold needs to have the throttle body in the same place as my current modified factory manifold, because the inter-cooler basically feeds directly into the throttle body, with only a short piece of silicone tubing in between. Current setup: My current thought on a new manifold: Obviously the rendering only shows one fuel rail/injector holder set and part of the body is left off, but you get the idea. I am thinking, cast the trumpets as two identical sets. Cast the injector holders. I have a bit to properly cut the injector holders/fuel rail to seat the injectors. Weld the body up from sheet and pipe. Machine the TB mount from billet and weld it on. Use bulkhead fittings to get the fuel in. Use hermetic fittings on the back side to "plug in" the injectors. Use clear plastic for the top, but it will probably actually need to be an aluminum frame with smaller 'windows' as the pressure on that large a piece would be excessive. I definitely want to be able to easily pull the top off to maintenance injectors and wiring. I have the 3D printer working on a trial set of trumpets - it's going to take days to print... Comments/Suggestions?