Regarding the air intake, I was in the same boat. Wasn't a great fan of drilling / cutting holes in the chassis for a CAI. The main problem is getting your pipe down to the bumper, which is made a bit difficult with the lack of room behind the headlight.
What I ended up doing, was buying a section of poly flex pipe and heating this up enough so I could shape it into a 0 shape. This allows you to fit the pipe between the chassis and the headlight without cutting the chassis. I'll get a photo of it if you're interested.
I know this isn't the best way to do it, but it does allow you to fit a 75mm pipe down to the bumper, yes, it has restrictions due to the reshaping of the pipe and because it doesn't have a smooth internal surface like Aluminium etc (if you buy enough of it you can compress it to get a semi smooth surface). However, if you're not building a high performance engine, if you're just putting the usual chip, exhaust, CAI and cam, I don't think you'll miss the extra kW or two from the flexi pipe compared to Al. But IMO, it's still better than factory and sounds alot better!