Hi Martin,
kinda depends on how much you want to spend and how easy you want it to be to fit!
I would say that an SRI (Short Ram Induction) is about the easiest to fit, you just remove the original resonator box from the throttle body and add your induction, I went for a K&N one (about £100 from eBay) and I'm really happy with it and it was dead easy to fit.
If you're feeling a bit more flush and adventurous you could go with a CAI (Cold Air Induction) which is a little harder to fit (and more expensive!) as the cone tend s to sit behind the front bumper, but you will get better results with one of these and a decent kit cost around £200+ for something like an Injen setup, eBay is your friend in this case!
There are loads of fitting instructions in the forum, a quick search will seek them out for you and my kit came with really easy to follow fitting instructions.
Hope that all makes sense and good luck!
S
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