It was so loud on the first power run which hit about 250hp. Warick then proceeded to look at the AFR via the HKS knock amp and confirmed mixtures were too lean.

We keep 2 AFRs sensors to read seperately as the wideband O2 sensor does wear out and it is always good to have the wideband on the Dyno and the HKS knock amp as a backup, which reads knock as well.