If you look theres fantastic results with near every ECU on the market but these days Plug ins are the way to go in all but the wildest race car when powerfull logging becomes a factor.I Fit and tune a lot of PFC and Wolf plugins and like them both and as ppl know im very por Wolf but i understand the software and like the extra functions it has over the PFC
and the fact i can change them to suit other cars like the R33 GTS Version can fit in to Z32-R32-Ceffero etc as sensors and firing order ETC can changed in the software and i still have a lot of inputs and outputs i can use for other functions like launch control, NOS control inc a different map for when the NOS is turned on plus it can use any TPS so custom Throttle bodys etc are easy and things like being able to run low impedance injectors without adding resistors and dwell-discharge control so different coils can be used.Walky from these forums is fitting his GTS plug and play to his Rotory now his sold his Skyline.
local life time warranty and free upgrades is also a bonus.
Some Other shops hate them and if you are happy with using thier shop a Wolf is a waste of time as i said earler use what your tuners happy with .There is other options to PFC but there a well knowen and easy to use product thu a little basic so the choice is yours.There is other options to PFC but there a well knowen and easy to use.