I actually just posted something about this before I saw this post.. I have 06 GT Auto with the Whipple- I am running 11.90's at 115-116. On a Mustang Dyno at sea level in hot/humid weather made 462 hp & 442 lb/ft torque at about 9.4lbs of boost. The only mods for power I did besides the Whipple kit (with intercooler) was a full exhaust. The motor is supposedly good for this kind of power. What supposedly is not strong enough is the
tranny. I had the
tranny built up and put in a drive shaft and converter (for durability- not speed).
The only problem I have now is some belt slip on the top end. The 6-rib setup with the Whipple is the weak part of the kit. Some time in the future I would like to upgrade the belt - and the suspention. But even with the stock suspension (except for H & R SS springs - which are not for drag racing anyway), I am pulling 1.7 60ft times on 265/40/18 MT ET Street drag radials. That's leaving the line at about 2500 rpm and SLOWLY stepping on the gas... To much right foot and I sit around while the tires spin.
So back to the original post - I don't see 450hp to the rear tires with the non-intercooled kit but definately more than 450 is possible with the intercooled kit. I don't know where 8lbs of boost fits in because I thought the options were 6lbs and 10 lbs. Based on my experience, I would say, assuming good driving and good conditions, on drag radials, you could realistically expect to see high 12's with the small kit & low 12's with the big kit.
