My 2009 Gt is equipped with Ford Racing Hot Rod cams, a Vortech V3 tuner kit, charge motion delete plugs, 60lb Ford injectors, and DeatschWerks 340lph in tank pump. Per the Vortech manual I installed Fresh OE spark plugs. After tuning it came down to 407 RWHP, with some drive ability concerns mainly on take off, below 2000 RPM. We also ran into some spark knock over 5000 RPM so we pulled timing and I've been running 50/50 mix 91 and 110 octane fuel. I would like to eliminate the stumbling below 2000 RPM and when rolling on the throttle while cruising. Is this possible with a draw through setup or do I need to go with a blow through MAF setup? I also would like to get away from the 110 octane do to price, should I go with a methanol injection kit or go with an intercooler? Just looking for some opinions/ideas.