i just fitted one to mine. they actually look ok, are set further out so wide rear doesn't chuff the can and the mid pipe is much larger than the very flat stocker..
i'm not sure how much acro is where you are but here the prices are..
the cheaper akra slip on $1000 new ($800 if you haggle your butt off)
akra header $1000-$1500AU
mid pipe. - do akra even make one? the stock one is tiny in the middle where its been squeezed. I've got to pull mine out to heat wrap it. I'll take some pics to compare. I payed about $1000AU for the full system shipped and sold my akra can for $650AU used and bashed.
Akra end can £400, header £370 so about £90 more than a DOMA from Bergos although it can be found for €125 euro less on another german site. None of this matters as I won't be buying anything new!!
I know what you're saying about the squish in the mid section though...
here is a comparison between the 2.
[attachment=0:5ykjiatl]IMG_0694.jpg[/attachment:5ykjiatl]
now i don't know if they do it for the 450. and the can does stick out a long way out the back but when you smash it just get it chopped and shortened. there is good clearance between the tire and the can tho.
I've heat wrapped my mid pipe as there really isn't a lot of room in there and it's just touching the engine case, also I didn't want the fuel pipe touching a hot pipe!
not had a chance to run it up fully yet as i have no track time. maybe at the MX track at the weekend if its dry.