For those of you that track your Boss, how often will you be changing plugs? The supplement calls for performing the 150,000 mile maintenance and multi-point inspection after track use. In the GT500 I changed them once a year but used iridium 100k mile plugs. They are a step colder than factory due to the higher boost levels I am running. Also, with the tune it dumps a lot more fuel in at WOT so the plugs will foul quicker.