I got faith in ESS that they wouldnt do it for no reason especially if it were harmful to the engine. According to their dyno the power at 7000rpm is the same as at 5000rpm for stage 2. Stock the power at the std redline is not so good as it has a more dramatic drop-off...unlike the M3
GIAC and Dinan also raise the RPM limit.
EDIT: the redline raising is not applicable for DCT transmissions as I was informed by ESS - excellent service by them in answering by questions btw.