$700 for a Chinese eBay exhaust? They claim its an invidia but how do you really know? You can buy a REAL magnaflow for that price. Or get a REAL invidia q300 with the quad tips for about $200 more. Plus it'll look lame on your 2011 with the single tips on each side.
Save an extra $200 and get the q300 that was designed for the 2011+ wrx