Another exhaust Question

So im sick of the exhaust sound on my xj650, the mufflers are all rusted and falling apart inside, it doesnt sound good at all.

After reading some other posts in here about exhaust i found some things i thought would work well, http://www.summitracing.com/parts/JEX-JTD112 but it is 1.5 inlet, my question is, would it be difficult to mount one of these on each header? since the header outlet is 1.25, ok i just noticed there is a spacer between the header and the rest of the exhaust, that im guessing makes it accept 1.5in exhaust?

i want to do something exactly like this, http://www.youtube.com/watch?v=BCjJodyYZdo

Also does it sound like theres baffles in the pipes in the video?

Last question, is there anywhere i can get a 2 into 1 adapter so i only have to buy two mufflers instead of four?

Any help will really be appreciated thanks guys!