Will these fit?

Ok, I loved my o/r H and Magnapacks for a while...but now they're a little too crackly for my taste. My buddy just got Flows with an O/R h on his cobra, and I love the sound. I'm thinking about buying some Flows, to replace the 'packs. I don't want to redo the hole catback, I want to just replace the mufflers. My question is will these fit?
http://store.summitracing.com/partdetail.asp?autofilter=1&part=FLO%2D952545&N=700+400238+308504+115&autoview=sku
From just looking at it, the only real difference is that they're wider than the round magnapacks, and they don't have a hanger on them. Has anyone done this? Will it work?
 
Well I was looking at the super 40s because I figured I'd need something that was centered on both the inlet and oulet, because of the way the magnapack catback pipes were. I looked around on summit, and I couldn't find any original 40s that weren't offset, and the super 40s did. Did you get yours to work on your SLP setup?
 
You will need the offset mufflers because of the location of the tailpipes. I have never looked at a Magnapack catback, but Im pretty sure any compitent muffler shop should be able to make them work. They might have to make you some new flowtubes from the midpipe connection to the muffler inlets though, but Im not sure. Its probably your off road midpipe thats making it crackle though. Adding cats would probably solve the crackling.