On Sun, 19 Dec 2004 farna@xxxxxxx wrote: > Draw through really isn't a good idea for low boost (15 psi or less) systems. For one thing the fuel mixture can erode turbine blades, but the main problem is in the even of a backfire. BOOM goes the turbo! Most carbs can take 5-10 psi with little of no leakage, aftermarket Holleys can take 20 psi and have been run at 25 psi WITHOUT a pressurized box, but 25 psi is pushing it. Blow through is the SAFEST way to go, and just turns out to be the easiest. It seemed like blow-through would eliminate a lot of the problems I read about with pressure equalization in the carb; backfire pop-off valves don't sound too hard to do, but corrosion I admit I never thought of. I haven't done any serious research, since it's all so far off right now. Trans is coming, valve cover etc when I get pd in Jan, hopefullyt in the car before Feb!