I have a 2000 zx3 with 2l zetec and have the following mods. Ford racing cnc ported head, comp cams stage 2 cams, aem adjustable cam gears, shorty intake tube, shorty header (may change to svt header), full 2.25" exhaust with low restriction cat and muffler, 65mm throttle body and ported intake, and tuning. I went from a stock 97 WHP to a stunning 111whp as measured on a dynojet dyno. This is a disappointing gain and expected far more. I understand numbers are different on a mustang dyno, but is irrevelent as I'm measuring overall gain here. I'm hoping for around 150-160 WHP as this is a group 2 rally car! Any input is hugely appreciated. What I'm thinking is this, shaved head (40 thou?), svt header, and I've been investigating a multi throttle body setup from Europe ( they seem to be way ahead getting power from these zetecs, and their kits come with ecu and tuning software, basemaps etc).