Injen intake would be a good option but they r pretty pricey. U can get a K&N filter to suit for around $100 or cheaper so id say if u can get a Stainless Steel 2.5" pipe made up to the design u want, even copy Injen's design... if that costs under $200 which im sure it will, id opt for that option.

I plan on doing this to my EG track car in the future as i can get a bigger diameter pipe, slotted to sit right behind the fog-light slot for plenty of fresh air, and it'll cost me peanuts compared to getting an Injen, which i think is a bit narrow for my application anyway.

Go see Peter at Carline Mufflers on Grange Rd, he's the man n will look after u. Only thing id say, the CAI or SRI wont make all that much difference on ur motor, if ur just after a bit of Grrrunt u can get that from any eBay $50 SRI kit.