I bought the Dominator Hi Rise slip on set up, but retained the headers and cat, for the time being. I've had Dom stuff before on a 1200 GSA, and 850 GSA.
Their engineering imo is superb, and fit is perfect on the Honda. The sound, with the DB killer, is deeper, reasonably loud, and sounds great. I've not tried it without the dbk.
For the TA from memory, they claim circa 2hp gain. A sound check on my phone does'nt do it justice, trust me on that. Think it was 10 working days supply from placing order. Check Dom website. Their delivery service using UPS was fast to NZ. Comms a little slow and brief, just the language barrier only and being busy i suspect. Their pricing is also very competitive to other brands.