OzcarMeyer, JHM has been testing on the RS4 motors for over 3 years. JHM has a huge investment into the RS4 motors. They started by taking apart a perfectly good mid mileage RS4 motor about 3 years ago and from there have been inspecting the motor at each stage of development of power. JHM even went to the length of getting a super high mileage motor and putting it into their test car and pushing tons of boost at it to see how it would react as well.
JHM have a long list of parts in development for the RS4 motors, from top to bottom. Many think the RS4 motors are good for huge HP, they are not. There are many small issues that either other people are not talking about or they don’t yet know.
The stage 2 S4 will be very competitive. The S4 motors make better Tq then the RS4 motors so, the stage 2 S4 has many advantages at stage 2 over the RS4. Keep in mind however the RS4 has a better gear ratio and 1000 more RPM then the S4, this helps play out an advantage on the 1/4 mile.