Yes it did Bill, on the Revo stage 2 it made 262 bhp and 265 torques on a local trusted Dyno. Same graph profile where the torque dropped off after 5500 pm.
Dont get me wrong Im really happy with the car, it pulls like a train and more inportantly the driveablility in absoloutley unreal. The torque delivery is crazy!
Im going to put a lower temp stat in and "wetter water" coolant into it to aid cooling, and another WMI nozzle in a throttle body adaptor plate to further aid cooling and boost the octane to try and battle any ignition timing pull.
Would it be possible to post the Dyno plots of both mine and Daz'z to show the effect of holding torque for that little bit longer can help reach the top figures?
And also, when are your came for sale?? ha ha!
Worn engine, some are simply tired due to poor treatment in earlier life well before your ownership.
Low compression, poor ring seal, allowing some oil content into the cylinder reducing knock resistance, it could be all sorts to be honest mate.
Compression / leak down test would be advisable before spending a fortune on additional cooling. Whilst cooling may well help, it'll potentially only be a sticking plaster on a bigger issue.