I have a 316ti sport and have seen on eBay some K&N 57i induction kits for reasonable money. £60-80. Wondering if anyone has an induction kit on a 316ti and what it sounds like or if it makes any difference to throttle response etc. I have also heard some of these eBay ones are fakes. Has anyone had any experience of this? I know the 316ti is no rocket ship and I'm not looking for massive power gains here. I would like it to sound a bit nicer however don't really want to change the exhaust.