very happy with my Y2K 88mm. Combo is close to yours. See sig. Im not sure it would support 1400hp, but 1200 is reasonable from this turbo. Its gone 8.89with 15psi and pedaling the car for most of the track. Y2ks are smaller than the thumper series, more of a mid frame T6 if you will. It allows it to pakage very nicley. Still a T6 unit, 5" down pipe, 3.5" comp outlet. Great choice. I may move up to a 91mm Y2K soon, but not sure it would be much different.
1989 Mustang LX/Dart 428w/Turbonetics 88mm/AFR 225's/Solid Roller/Glide/FAST XFI -Nearing Retirement!
2011 FFR Type 65 Coupe (build in progress)- Dart 428Twin Turbo, Fast XFI, T56 - Just a street car!
2012 STI - Cobb stage 1 tune daily driver