Need nice little tailpipe on the back of that mate. Somewhere between 3'-4'
Sportex or Peco will look ok and not break the bank, check these for back box options:
Sportex -
www.tuning.co.uk
Peco (and others) -
www.performancecentre.co.uk
That and a nice dimma grill,and thata look spot on maybe a tad lower and its all done