Apologies if this has been asked before but I couldn't get the exact answers by doing a search. I have a 1.8 Marea weekend and I'm toying with the idea of fitting an induction kit, but would also consider a panel filter if it made a difference. Question is which brand of filter and what type, induction or panel. I had a K&N panel filter on an old car of mine but found no difference at all, but I read the sticky post in the tech section about adapting the existing airbox which was interesting. GSR's seem popular here, anybody ever try a range of induction kits to see what if any difference there is?