I had 7 more horses after fitting this, it went up from 273 to 280bhp. Used a different company for the second rolling road session so this isn't conclusive. I'm very sceptical about the accuracy of dyno's anyway, no 2 will ever give the same results. In fact my first rolling road gave a torque figure of 252 lbft and this one was down to 240 lbft. Maybe the Fujitsbo exhaust and HKS sports cats have caused the reduction in torque, who knows Not worried though, can't feel the difference, and the sound more than makes up for it.