Are you after looks as well as performance and sound?

I ask because if you want your car to be quiet and don't mind the look of your stock exhaust you could just leave it and upgrade your CAI?

I have a Fujita CAI on my DC4 which I bought off ebay, much cheaper than buying Injen in Australia and I am more than happy with it. It really opens up the sound of the engine, sounds really nice at high revs but I would hardly call it loud.