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I know some folks are running the whipple tune with Kooks/green cats without a CEL. Did you use the O2 sensor wire extensions, too? My headers installer was concerned the wire extensions could cause inaccurate signals being sent to the ECU, possibly causing the computer to run the motor too...

Baseline before install (corrected)- 326 whp, 305 wtq. After install (corrected) - 576 whp, 480 wtq. After install (uncorrected) - 590 whp, 492 wtq. After seeing such low baseline numbers, installer recalibrated his dyno and did 5 pulls with same results. He said he couldn't explain why...