Hey Chics,
For what its worth, and this is just my opinion I do not like the stretched look of tires on a cobra. I did a 10 sec search and the link below has a pic of a 255 on a 10 inch rim (about the 5th or 6th post down). Note that this is a quick pic and I not referring to the exact size however you get the idea.
help with wheel sizes and offsets please - Pelican Parts Technical BBS
The drifting comment was referring to the drifting cars which run crazy tire stretch. But these guys go way overboard. Again I just do not think that they belong on a cobra.
The MT in the above link would be the money. These will fill those cobra guards and give you some traction.
Link again.
http://www.summitracing.com/parts/mtt-3794r