Nothing? dang... thought I'd at least get a response on the 2nd question
Timing is not a seperate "setting" per say - in all but the 93 octane tunes, you can only reduce the timing by 2*. That doesn't negate the fact that SC has modified the timing across the board already by however much they wanted to at that place in the timing tables.With Superchips you have to actually set the timing seperately. Its your option to have timing advanced or not. With these modules it also messes with the transmission and the tq converter and how it gets applied in the rpm rang. Pinging can also be caused by bad fuel or a spark plug issue. My 05 frontier and my 06 titan had some pinging until I put a CAI on and helped the issue. It was not really pining just seemed like and asthsmatic having problems unitl he used an inhalier.
The diverter valve issue is only 05's IIRCA bunch of these trucks have messed up plenum diverter valves that will rattle around 1200 rpm or so part throttle. It sounds an awful lot like spark knock/pinging.
Mine done it from day one off the dealer floor, nearly impossible to locate (took 30kmi. to figure it out) , easy enough to repair though.
Heat soak on the intake tract can make them rattle/ping hard, and the *2 advance on the BullyDog makes it far worse if you dont run good fuel.