Two questions

[Techen]

Am starting to smell petrol everytime i stop the car or leave it idle. Had a quick google and could be anything. Is there any super common things i could have a look at as to what it could be?

Second, How do i get rid of the blow off sound my car makes now. Seems after i put on a ramair and a remap its super loud. Not much of a boy racer would rather keep it sounding stock. Would a DV+ fix it?

Thanks.