For what it’s worth…
If you look at the Ford Racing Performance Parts kits for the new 5.0... The seven pound kit comes with a 12/12000 warranty and the nine pound kit doesn't, Ford has done the testing for FRPP…
There's a blower in my fairly near future, probably one of these, and right away noted this as well...tells me they have a measurable level of confidence in the drivetrain with a 25% power uprate (525), but not so much in a 50 (624). Clutch and axles aren't bad (clutch likely a must), possibly a rear end, but it'd be a bummer to roast this transmission.
Read about the performance of the GT-350 w/the 525HP blower?
3.7 sec to 60 and 12.0 qtr @ 121+...I'm thinking that'll do me just fine. (note Shelby comes right out and tells you if you opt for the 624 it voids the power train warranty).
I've downloaded and printed off the install instructions for the FR Super pack...same set for both blowers, including the parts list. Disappointed that with it I couldn't determine the difference between the 2 kits, other than that it's only $300...which in itself is very seductive. The parts section that includes the blower and pully doesn't actually list part #'s, but in their place in that column, lists NPN...assuming no part number. Note that the FR site states they build these to order.
Have written my serv mgr regarding prices, including install, and if he could tell me the diff between the 2 kits...ie if the blowers are actually the same but pullys and maybe throttle body are only difference, but have yet to hear back from him.
When I drop this much coin, would be real nice to know before hand whether without much additional cost, I could upgrade the 525 to 624 specs after beefing up drive train and maybe connecting rods.
Also reading about a gent who bought a 2.9l Whipple w/8 and 10# pullies (think made for the 5.4l GT500 motor) in a 5.0...w/is interesting. Perhaps another option, still researching.
2012 GT Prem Cp, Kona w/MT-82, 401A, 3.73's & HID/Sec. GT-500 Spoiler & OE sidescoops. FR Pwr Upgrd & FR3 Adj Hndl Packs. MaxMoto CC plates. BMR Adj Panhard. 255/45 and 285/40-18 Conti DW's on silver Forgestar CF5's.Tint, clear bra, CDC Dead Pedal, JLT Oil Separator and Black in Back.
Ordered 3/18/11. Built 5/4. ETA 5/22. Arrived 5/24.