I really wouldn't recommend getting springs on an XI because of the reason the above poster stated. The springs will eventually break. Unfortunately with XI models, the only way to play is to pay $$$. But you get what you pay for.
Austin Yellow M4 15' (704 whp / 672 lb/tq) -> 800+???
AWE Non-Res Exhaust | BMS Intake | AWE ColdFront | EoS Intercooler | ER Downpipes | ER Chargepipes | JB4 | Ice Tank | Custom SS Methanol | Swift Springs | TPG/DSS 1200hp Axles | Dodson Sportsman DCT Clutch | PURE Stage ? Ti's | Port Injection | Built Motor (Pauter Rods, Wiseco Pistons, Port & Polish)