We've got a 2002 mk6 1.4 petrol fiesta. We bought it earlier this year as a cheap runaround for the mrs, it ran fine for about 6 odd months then all of a sudden, it sounded like the back box went! I bought a new centre section and back box and gave it a mini service of, spark plugs, oil and filter and air filter, but it still sounds like the exhaust is blowing and it smells really rich! Any ideas what it could be? Cheers people!