My diffs factory std, 4 speed was built 5 years ago and still have the factory turbo on it . You need a really good cooler, plenum while your at it, airbox as well, fuel system upgrade, turbo flap mod , actuator changed, stall convertor, 3.5 - 4 inch exhaust, 4 inch dump pipe. Your looking at about 11k if not more just there, plus you need a good tuner. Also costs for tuning and labour to fit all the parts. May have missed something but I'm distracted with some great porn at the moment.