Bought the car last weekend and it seems to have a bit of a faint knock on the rear end so it's going into Alan at AS Performance in County Durham for a bit of a once over.. It was only serviced a 1000 miles ago but he's changing oil/filter too just to be sure it is what it should be

I'm having the air filter changed too and wondered what most of you recommend? I believe it's standard at mo but will be mapping it in a few months... So, green panel filter or K&N panel filter, those are my choices