•Brand New •Pypes Performance Exhaust part # HFM55E •Fits 2005-2010 Ford Mustang GT w/ Pypes HDR55S Long Tube Headers •409 stainless steel construction •Includes instructions and all hardware required for installation •2.5" mandrel bent pipe •Comes with catalytic converters made from a high quality 304 grade stainless steel •These EPA compliant catalytic converters are the best in the market in terms of performance, design, and longevity. •Cats feature a 2.5” slip fit design with an overall length of 11”. The overall diameter is 4”. •Provides more horsepower & torque, increased fuel economy, lower emissions, & better sound control •USA Made •High Platinum Load •O2 Bung Equipped •Proper air/fuel ratio will allow your catalytic converters to last a lot longer without getting clogged, fuel being too rich is the cause of most catalytic converter failure