Why did the power fall off on the last 2 runs? Heatsoak? If track usage is in your future then that will be a problem.
In the summer, stock cars have heat problems if driven hard. Can't imagine it being any better bolting a s/c'er on it.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red