My stall convertor was custom made through Dion originally, it is smaller in diameter (240mm I think), so yes it doesnt show its true figure, Dion did a before and after and measured it at 24rwkw loss, so 312 and 24, power was at 336rwkw. So no it isnt Nitrous *Beep* u can ask him yourself....lol I just know my ute better and used better tyres than what you did, my 60ft was 1.66, and yours was what 2.xxxx do the maths you should of ran alot quicker. Il try and headout next meet, power is very similiar to what I had before, and doesnt come on as hard like previously as my motor is just about clocking up 100 thousand kms