Hi all, I have owned an E92 M3 in the past which I supercharged with an ESS VT600 kit, very quick !!. I have since sold the car on and I bought one of the last of the E92 M3s from new. The car is coming to the end of a three year PCP and I think I may keep it as I dont want another PCP over 4 years. To this end I have the modding bug again and am thinking of supercharging this one to around the 600 bhp mark. Looking at options the ESS kit versus the G power kit, similar power gains but G Power is twice the price, why ?? It looks a better kit manufacturing wise but for twice the price ? Any one shed any light on this, are the blowers different, power delivery different or anything else ? The car has BBK, Akrapovic Evolution exhaust so is ready to go, any advice most appreciated.