I'd have to say my average 0-60 is just under 4 seconds. Below are my mods. Vehicle did the 1/4 in 12.5 at 111mph. I think at that trap it should be closer to 12.2-12.3. It's pushing 400WHP and keep in mind the damn thing weighs 4055lbs.
Catless AR Design downpipes
Full catless Autobahn Exotics exhaust (Sounds sick)
AFE dual cone intake
JB4 (runs were done on map 3, full meth map)
Burger Tuning meth kit
Burger Tuning upgraded charge pipe
ETS 5" FMIC
Opening the exhaust up helped, but the biggest gains are from the JB4 and the meth kit. The rest helps the car breathe better. I love my XI.