Defo recommend Powerflow. I originally had a backbox fitted by them (Oh yeah, mines only a 1.2 as well!). The results were good, was fairly loud. I wanted to make it louder though, so went back a few months later and they stuck a De-Cat on. It pops constantly now and is so much louder!! So i'd recommend getting the exhaust and maybe a De-Cat later on down the line and you'll notice the sound difference!!
Well worth it!