AMG V8 showdown, M156 (M159) versus M157 - CLS63 AMG with PP-Performance Stage 2 tune races an SLS AMG with full exhaust
We are going to be seeing many more M156 versus M157 comparisons as more and more owners of both of these motors modify them. This is a great race but obviously the M159 (based on the M156) V8 in the SLS AMG is at a power disadvantage versus the factory twin turbo M157 motor. The SLS holds off the CLS 63 AMG early on thanks in part to its quick shifting transmission but eventually the power of the ecu tuned CLS 63 AMG shows up top and it walks away. The SLS only has a full Supersprint exhaust so it does quite well considering the horsepower and torque disparity. If the SLS had some boost as well, say from a Weistec supercharger
, the result would likely be quite different and in the favor the SLS.