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RPW (Racing Performance Works) makes aftermarket headers and manifolds for the 4g15.
Here's some things I put on my car and how well they worked...
1. Tornado/Air vortex gen. - No. Waste of money. Fact I took it off. and burned it. 2. APC Short Ram Intake - Yes, but performance only barely noticable. 3. 2.25" Cat-Back - Again, barely " " " etc. 4. RPW Headers - YES. Very loud, but very worth the performance! 5. Juice Box - Yes (about the same as apc and cat-back together), but if you plan on using Haltech or Motec or etc, then don't put the crap on. 6. 210cc injectors - Yes, effect like the rpw's, but your wallet will feel it if you know what I mean.
Soon I'll be installing a fuel pressure regulator to fully utilize the larger injectors.
About #1, take DFBonnetts' suggestion.
Hope this helps.
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