Kooks has long tubes ready to go for the 2011 Mustang GT 5.0. Of course, the quality and fit is fantastic as expected from Kooks. 1.75" seems to be the best size for the new 5.0 engine and power gains are amazing - 30+ hp gains on a stock engine! Stainless steel construction with everything needed to install. Matching H or X pipes with or without cats as well as complete catbacks are available to complete the system.