I've bought multiple forms of FI used. Ask the right questions, protect your purchase with your paypal or credit card and have at 'er.
The F1 isn't worth the premium here though and not suitable for a street car, especially if it's one of their cog race kits. People are at or close to 1000 horse on the P2200 head unit, on 8 rib serpentine.
Both will blow the stock engine to smithereens if pushed.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP