Only problem I had with my Mac catback was that it took some tweaking to get the fitment right. I put on a prochamber at the same time, and with all the different part, it just took some patience to get it all just right.
Mine came pretty close to rubbing the gas tank cover on the passenger side, but I didn't have any spots that actually touched or rattled.
Mine was the non-SS version, but I don't think that would matter for fitment purposes.