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Evolution Performance installed a catback exhaust, x-pipe, tune, and k&n drop in filter on their 2011 Mustang GT 5.0 test car on Saturday. They finally posted the results today.
The stock numbers were 368rwhp/352rwtq and 405rwhp/375rwtq after the mods, a gain of 36rwhp/23rwtq.
Here's the dynograph provided by Evolution Performance: