its like comparing a turbo design in the 1980s and GTRS which is a few year old if not newer. 2540 is not a lag machine, its more like a drift turbo... im gettin my car dynoed tomorow and let u know how this HKS GT2540 goes..... got all mods like powerfc, injectors, cooler, full exhuast, coil pack, z32, reg, pump, big clutch- so nothin is holding me back- no internal work so well see how it goes but im hoping abuot 250rkw.