Well if you want to run Cats you would have to go with Stillen's Shorty headers which from what I hear do nothing since the stock Exhaust Manifold is not restrictive. Your other option is Long Tube Headers by Fast Intentions. But for the price of them and the install price I dont think the small gains are worth it over test pipes.
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2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness.
???Whp ???WTQ (Will find out come spring time)
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