If you plan to stay NA my experience in a G37 was , FI resonated HFC, Motordyne XYZ with exhaust, Takeda long tubes ( or Gen 3) PST carbon driveshaft ( not necessary on a Z) Uprev w/ tuner cable and Motordyne intake manifold. The mod I felt the most from that should have been the first was changing the rear diff to a 3.69 from a 6mt into my 7at which was originally 3.36. The issue is where you plan to go. If you plan on boosting later skip everything and just get your money set for boost. Otherwise stay rational in your expectations because for the money spent it can be crushing when you find that you spent 2/3 boost money and made 1/4 the gain.
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