Do you? That seems a bit extreme... what does your McLaren SLR run in the 1 mile speed test? Without ever driving one, I'd expect it to run between 22.5 and 23.0 ?
Have you read Dr Slump's tuning bible? That was the first thing I did. I would start off with a Viper ACR first, as they are more commonly used, meaning that you can find more help. Then go onto the SLR.