I have the actual NISMO OEM exhaust from a NISMO Z. I saw no point in the S-Tune. The design of it seemed pointless. The OEM NISMO is a true dual exhaust (one muffler, but it has two separate chambers), unlike the S-Tune.
Yeah, I'm concerned about messing with the ECU at all because I don't want to screw up the car or have any issues with the warranty. I figured installing a stock NISMO ECU would avoid both of these issues.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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