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Amays U G37S »
https://forums.nicoclub.com/amays-u-g37s-u167091.html
Tue May 10, 2011 7:36 am
HFC would be your first purchase. There has been a large amount of HP gains with the HFC's (High Flow Cat). Secondly, since you are in the exhaust area, go for the Full Stillen exhaust. Or the Tanabe Medallian duel mufflers. These give a nice look, and a small performance gain, with a deeper sound, but not to deep or loud. Intake (considering we have dual's) would be either the Short Ram R2C intake, or Long Tube Stillen Gen 3. These are the 2 best intakes in my opinion out right now.
Goodluck!