Atleast I've never had to replace my dash IP.
The S4 has a BMEP of 16.27 BAR, quite good, but that puts it inbetween a cobalt SS (17 BAR) and a Mustang Cobra (2003) @ 14.3 BAR. For comparison, the Evo IX roughly has 24.6 BAR...
The S52 has 13.75 BAR, which puts it above the F430 (13.56), the 07 Z06 (11.57), and the Viper 8.3L (10.99)
If you cant appreciate the performance of the M motors...you are straight up ignorant.