BMW 320d SE
Exhaust started blowing the other day. Took it to ATS today, and the Cat has rusted through around the back, and is blowing into the heatshield. The car is booked in at Renault on Thursday for them to have a look. What I want to know is, will they replace it under warranty? The car is less than 3 years old, but I have an aftermarket s/s cat-back system on. Will that make that any difference?