OK guys, I need help already! After fitting a K Tec back box on Saturday the car was running lovely. Its a 3 yr old 230. Today after a 5 minute gentle drive the car started sounding like it was on 5 cylinders. The exhaust sounded louder and low down it sounded like a V8 TVR. No warning lights came up but it was definately missing and holding back (sounded gorgeous mind). Got the car home, parked it up and went back an hour later to check it over.....still misfiring with a lumpy tickover at 500rpm and now the exhaust emission light is flashing, though not staying on permanent. Manual says drive at reduced speed to Renault. But I'll be fooked if I am letting Renault Croydon look at it. Anyone had this experience. Is it the new exhaust or has a plug jumped off? I figured if it was electrical the other engine management light would have come on. Scared to drive it on a misfire incase something melts or I burn the cat out. Over to you guys.....