glad i brought a s2 now and not an s1 . my mate had a r33 gtst skyline and it had a cooler , 3'' exhaust , pod filter and was running 10 psi even after it was tuned on a dyno it still only made 175 kw , my s2 stagea is basicly stock except for a cat back exhaust and k&n filter element and stock cooler and it still made 170.8 kw when tuned , the neo is an awasome motor im so glad i brought it over the earlyer one .