K, this is my 2nd ECU in my SE-R thats from JWT...and its the 2nd ****ed up one already. 1st one was totally custom, for my DET with NISMO 555cc injectors and a Z32 TTZ MAF. Well they got that one all wrong and the car would not idle good and stumble like hell. The injector duty was all ****ed up. 2nd ECU for NA, the car overheats when just idleing. It hasn't done this with a Cali ECU, so I know its the ECU. I don't feel any diff eighter. So I give it 2 thumbs down-not worth 595 bux. I also have their clutch, about 25K miles on it, and also some turbo miles and its not as good as a ACT clutch. Its slips a bit. JWT S3 cams, installed in a 98 SE-R, the RIGHT way, and checked lost almost 15HP at low RRMs over stock, and gained 4-6HP on very very top end... whats up with that ? There are other companies out there that I think have been working on Nissans for way longer than JWT and know their ****. This is why I don't recomend JWT products at all.