Owain, I did the same, £40 for a CAI and an hours work, it sounds great!!Owain said:When I got my SRI I accepted that it was more for the better noise and slightly de-restricted induction than it was for increased performance and just bought a crappy generic one off the shelf at a random shop.
Do I now have tons more power? No.
Does it sound awesome? Yes, yes it does
You'll probably find a fair few on eBay and as I say mine was a crappy one and it's lasted about 18 months so far, so don't feel the need to throw tons of cash at it straight away. If I'm ever bothered enough I might change it for a CAI, but then it wouldn't sound as good - even if I do end up changing it I've hardly wasted any money on the SRI. The very joy of modding is that if you don't like it you can just change it back off and try something else
Best of luck Neil.