This kit makes conversion to a SMOKERS stack system as easy as it gets. 4" Mandrel bent tubing ensures optimal exhaust flow. This kit fits any 4" performance exhaust system (excluding diesel particulate filter equipped vehicles). With the mounting kit specific to your vehicle and your choice of stacks (both purchased separately) you have everything you need for the hottest race style truck on the block. Fits All Full Size Diesel Pick up Trucks (excluding diesel particulate filter equipped vehicles).