From what I've read, the general consensus on intakes is that they really don't do much other than increase sound. The factory intake setup is already a cold air design that flows more than adequately. Some people have measured higher IAT's with aftermarket setups, so you might actually lose power going that route.
Exhaust wise I'd start with the top speed bypass pipes. They're cheap, relatively simple to install, and give a modest bump in sound. If thats not loud enough, add a muffler and you'll have a pretty mean sounding setup.
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