I think you would probably make more power with the IM and TB. ITBs work on a race car b/c there is a race motor to go with them. Talk to blackR on here, he lost power switching to ITBs and his setup is pretty well modded, hytech header, toda cams, cam gears, itr engine, reving it to 10k, dont really remember what else. I know for K series the cars that make the most power run intake manifolds.