This is probably nothing, but it is bugging me and really need to know why it does that?
Couple of weeks ago, I had a cat back Milltek exhaust system fitted to the car. It has been great, until this Saturday as I was sitting stationary in traffic on the M25 the exhaust began to pop as if someone is making popcorn in a microwave. I revved the car a little and the popping stops. However, since then, it still does it sometimes when the car is not moving.
Is this a problem or is it just a normal thing a Milltek exhaust does?