I got a termi assy system at xmas for £685 new from a duke dealer through ebay.Otherwise your looking at about £1150 rrp.According to Performance Bikes their long term 749s only got a 1bhp increase,so its not worth it on the power front.It does sound bloody great though,and from what i gather it depends where you are in the uk as to how the police look at it.I had a race system on my KTM 640 for 2 years and never got pulled,and that was much louder.As for the pipe in your attachment,no thanks,it's trying too hard.