Nature of the beast mate,you going just have to suck the lemon.You want to come where i am.20mph zone all yellow sleeping policemen and speed humps,i cant even take the kids to school or go to asda without hitting them.The only thing i have found i can do is straggle two humps at one time.Anything else just results in a big fat scraping noise and everyone looks at you.My pipe is 3 and a half but the car is standard ride height,its been off 3 times now !!