Stillen Gen 3 intakes and FI exhaust with upRev tuning seem to be the most popular bolt on and tuning options here, but also consider weight reduction opportunities if you're looking for bang for the buck. There's spare tire removal, rear hatch weight removal, lightweight battery, etc. that could prove very efficient in producing performance upgrades maybe not from an hp perspective, but definitely when looking at an hp/weight ratio. A lot of fellow helpful forum members have created threads on weight reduction in the DIY section that are extremely helpful.
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Ross
'11 370z
Just getting started . . .
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