I agree...7.5 is ALOT....all of the kits sold here are in the 4-4.5 lbs range and the turbo isin the 6ish but it had an intercooler. I am of the opinion a 7.5 lbs will blow the engine.
My iA supercharger is running 4.5lbs.
But..hey run with 7.5 if it doesn't blow your in a year I may do up mine
Gary