Check it out and see if it is Alumunized. I know you get a lot of snow there in the winter and they don't hold up as well as the Stainless ones do. Sounds like a good price though. You can get it brand new fron Trubenz.com for that for the aluminized and a little more for the stainless.
The information they give on it, So I'm guessing that it is a Stainless steel, and that would be alot better than aluminum in Missouri?
"The MagnaFlow Ford Focus System is all stainless steel featuring 2-1/4" high-flowing mandrel-bent stainless tubing, a straight-through Mirror Finish, stainless steel MagnaFlow Performance muffler, and is completed with a 4-1/2" double-wall polished stainless steel tip. Focus enthusiasts will love the looks, performance and the smooth, deep tone of this Wide Open performance system."
I bought my Magnaflow off ebay 2 weeks a go for the same price... Perfomance-Curve was the seller I believe... Received it in about 4 days. Installed it myself (it's pretty damn easy if you can get the bolts loose on the end of the flex pipe). Sounds great, deep and throaty, not tin-y (like the tin can mufflers). You'll love it.
Hey, I got that from Ebay too. I posted the great deal a few weeks back. I can't even get it for that pricing. I bought myself one from the same seller. I heard he takes awhile to ship out but it's worth the wait.