Well just fitted it (perfect fit by the way)... with the sebring backbox on the end it sounded crap.. seriously, crap! quiet at idle raspy as hell with revs.. not my cuppa tea.
Left open it sounds lovely, nice deep rumble on idle and no raspyness until about 5-6k revs. The over-run sounds just mint but perhaps a little loud..
I can't test how it sounds with my peco bigbore 2 as the diameters are the same so will have to get my dad to hold it over tomorrow.
So going to the exhaust shop on Saturday, it'll either be the peco, or a bit of pipe with round tailpipes

Sadly it's obvious what the lack of backpressure does, it seriously hurts the mid-range
