I have just upgraded with the following:
V&H 450 destroyer slip ons
D&D true 2 into 2 headers
Thunder Max Tuner and Intake
The bike runs faster, cooler, and stronger. This entire set up cost me about 2400.00. Was it worth it? Yes for me but may be too much for others. Just remember you get what you pay for. Also with the TM auto tuner you will not have to Dyno your bike for any more adds unless you just like to spend money. Sure you can go for the 300-400 dollar tuners...but then when you realize that it will not do it for you...well you just wasted that money. So if you can afford it..go for the Thundermax Auto Tuner.
Those look a bit smaller than the V&H dresser duals but they still look good! Have you had any problems with them dragging? Going by the pics on their website it appears that you can see the frame beneath them..?