1200 Dominator De Cat Pipe

You'd be better off removing the exhaust valve rather than shelling out for a mid section with no custom fuelling map/open end can (in my opinion)

 

Removing the CAT, which provides the vast majority of the silencing, whilst retaining the original end can (which is effectively straight though) will make the bike very loud. I accept that this is subjective but on long rides it will be tiresome. The majority of other road users, the general public (especially your neighbours) and MOT testers will see it as unacceptable. There's fruity and then there's obnoxious, this would fall into the latter category.

Just my 2 peneth... [hiding behind sofa]

 

You can't go far wrong at that price, just remember you'll need some kind of long tail pipe to try and quieten it down, it'll be unbearably loud with a standard tail pipe or any short pipe. Even with the long Termignoni can it's borderline obnoxious!

 

I dare say you can control the volume somewhat with baffles, you'd have to experiment. You can obviously get baffles for the tail pipe but, you can get internal baffles to go in the end of the de-cat too.
My Termi with a baffle in is just about OK, it's still loud and I wear earplugs, without the baffle it's obnoxious.
The baffle also has an effect on power, with the baffle in I have great low to mid range power/torque, with the baffle out I lose a bit of low down grunt but, get a lot more top end, the difference is very noticeable.