paul you do that and you aint ever gonna get on track apart from full noise days, alex' old cabrio was stupid loud

also you could have a issue on the MOT as if its louder than normal for the car it will fail unless you get a bent one

also a vosa check which are getting popular will also fail and should vosa check it the car will be impounded and has to be collected on a trailor and the MOT void and need trailering to a MOT place to pass again