...Corrupts Absolutely.
I thought this was going to be a history lesson on John Dalhberg. Lol!
I'm doing another dyno next week, but last dyno I did I made 549whp and 512wtq and all I had at the was a charcoal filter delete and the RPi GTM exhaust.
660hp is a little outrageous, but after calculating for drive train losses on two different dynos I did, we calculated I should be making somewhere between 622 and 644hp to the crank.
But, yeah people should not mess with an F-Series ///M car, including the new upcoming M3/M4, our torque is no joke. However, being a skilled driver and managing all that torque and horsepower from a RWD car is another matter entirely.