We removed the balance shafts in our 1st-2nd gen DSM's to free up some horsepower but sacrificed some vibration as a result. I have heard of some SRT-4's doing the same as well. There were also some rumors of the balance shaft assembly failing in some high horsepower srt-4 motors but I have yet to see any specific instances were the balance assembly is solely at fault. IMO, if you plan on building up your A855 you might as well remove the balancer assembly once the engine is apart to save yourself any headaches in the future. I believe there's a "How-To" thread illustrating the process on srtforums.