Bringing this thread back to see if the past couple years have yielded any new comparisons or impressions of the GP M2 vs. the Competition Werkes GP slipon? Any new comparisons between the two? Youtube videos are hard to tell, and I haven't seen a direct comparison between the two in the same video.
I'm trying to determine if the GP M2 will be more mellow or any deeper than the CW. I'm running the CW without the silencer now because it sounds better, but it's simply too loud for me on the street. I also have a bazzaz to tune with.