Upgrading to a Precision 7675 turbo over the winter along with a dart 363Boost cranked up to 20-22psi....Will a 3" down pipe to (2) 2 1/2 " pipes dumped at the axle be too small? At the track its open down pipe. Exhaust A/R will be .81 (i think)..I could also get a .96.. description of this turbo says its a 3 5/8" ehaust flange. Other 7675 turbos you can get a 4" exhaust. I dont really want to fabricate a 4" exhaust. Need some recommendations. Thanks. Also was looking at a Comp Turbo...Anyone have any feed back on this brand?