Muffler flow tests and Exhaust theory April 17, 2008, 11:52:18 AM http://www.allfordmustangs.com/Detailed/70.shtmlQuoteAccording to the recent Mustang poll, more than 1/2 of voters would or did spend their first modification dollars or exhaust. Easy decision on what to do, but the real decision lies in whose exhaust to buy. With more than a dozen companies making cat-back systems alone for Mustangs, the trying to figure out how it will work with your combination can be overwhelming. Don't fret we're here to help.We obtained 10 different after-cat exhaust configurations for 1987-1993 Mustangs (1979-1986 can use the same setups if converted to true dual exhaust). The goal is to illustrate key points of each system and explain how it worked on the test car to help you make an informed decision on what system might be best for you.