Welcome, fellow MD'er
Long tube CAI's get the best gains. Pop chargers will get you a small gain and decent sound. Post MAF tubes and K&N filters alone will give you a bump with little difference in sound.
When looking into exhaust mods, normal CBE's aren't THAT much louder. The Nismo exhaust gives gains without much more noise. But if you replace your stock cats with HFC's or Test Pipes, you'll be extremely loud.
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