i had my stage 1 saff for a year and only replaced, plugs, actuator, shocker, discs and pads, never had any engine probs, all that cost me around £1000 but the fun it gives is priceless, if you think about it, some1 pays £13000+ for an escoss cossie then runnin probs on top of that. u can get a saff for 4000 and have 10000 to spend on it wae hae