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I also have a set from my Z performance. I am in Massachusetts

1) Gains (tune only vs adding LDPs): Intakes + exhaust + tune: ~30–40 whp. Big drivability and thermal improvement, very safe. Add LDPs: ~50–70 whp total. More midrange/top-end, but added heat and smell. Still reliable if tuned conservatively. 2) 2.5” vs 3” exhaust: At this power level, 2.5” is...

Deciding between the closed AMS intake and the 80mm open setup really comes down to what you’re trying to do with the car. The usual knock on the 80mm system is valid—it bypasses the factory ducting, so you lose the OEM pressure advantage and you see higher IATs, especially when the car...