Hi - i replaced all 4 exhaust sections last week with the Alfaholics system. I was a little concerned it might sounds too loud and too boy racer for me, but haven't spoken to Andrew at Alfaholics, i decided to try it. And i am so pleased i did. At tickover it sounds just a little more meaningful than the OEM, but it isn't noticeable that it is a performance system. When driving it sounds lovely, a little more sporty than than OEM, but not at all boomy on the motorway, due to the same number of silencers as OEM system.
Highly recommend it - wish i had changed it before!