The Typhoon system will be a lot better for your car only because it's made to be. K&N has a long history of being good in that area (at least that's what they say. Heard no complaints though). If you're going to do the build-your-own Spectre thing, just make sure you don't lay any plastic parts on anything very hot, and you'll be good! I had a short-ram one that I made and it was good for what it was. Sounded great. But, one thing that I didn't do was build a heat shield. You definitely want one of those lol.
P.S., have you tried looking at a Volant, FSwerks, Steeda, Factory Tuned, Injen, AEM, anything like that? K&N systems, while nice, can be pretty pricy.