I have the ECU limiter set at 6500 and HAD a TCU set to 6400 rpm on the S/W switch. Stock TCU tune in S and modified to 6400 in W. Also, it would hold the gear until you upshifted manually. The increased power from 6000 to 6300 on the dyno was 20 hp on my car. Sounds perfect. Unfortunately I couldn't enjoy the extra rpms and power because I kept hitting bouncing off the rev limiter. The only place it worked correctly was on the dyno. The TCU was from EVOTECH I believe. Perhaps if I'd had both from Eurocharged the result would've been better. I don't know. But yes, more revs = more power. How long the valve springs can handle the extra rev's is anybodies guess.

Les