heres the "law" you are not allowed to modify the exhaust if it makes it any louder than the standard exhaust when it came out the factory, when it leaves the factory its will be ie 78db if you then put an exhaust on that is louder than the 78db you are modifying the car illegally, you will then get your £30 fine and be told your exhaust is illegal, if you do not change or alter it to make it legal you are then aware of an illegal modification on your car hence the 3 points sorry guys we re screwed...