If I was to turbo, I would be looking at maximizing two things, torque area under the curve, which can be seen from dynos and the time delta between off boost and boost threshold (transient). For a street based car that will see AutoX and track often, I really like a torque curve as Ptuning has demonstrated. That got me to looking at these turbos because 200 lb/ft at 2500rpm would just be disgusting!:
Borg Warner EFR 6258 (PINK) vs GTX2867
