i watched one being fitted down at DMS,
nice piece of kit, looks really nice, but can be an arse to fit "straight", DMS got it on, but the issue was that the exhaust wasn't straight as well. they had to crack out the big hammers and the oxy-aceterlyne to re shape a hanger.
it was do able but took far longer than expected and a 2 man job to fit.
although its not all systems, i think it was a bad batch, as some people suffer, others don't.
CS also does the K2 which is similar to the scorpion, but doesn't have the fitment issues.