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I was running Stage 1 with an OFT Tune. Switched over to a Gruppe S UEL header and ECU Tech Tune (on Dyno) and it was a HUGE difference (currently 190 HP at the wheels on 92 Octane) and the Torque dip is drastically reduced. The rest of the exhaust remained stock. It's really pretty quiet (unless I'm just starting up or I jump on it) Wished I would have done it sooner it's really night and day difference.
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