Diesel engines need plenty of air to produce power and proper emissions. When you are pulling up a hill or accelerating, a high flow exhaust is critical to good engine performance. During the original engine installation, the turbo down pipe is attached, and results in a crushed pipe. On the original exhaust, there are flow restrictions at the turbo outlet pipe, and in the muffler. The rest of the pipe is usually only a 2.75" diameter. Our 4" full mandrel bent aluminized pipe corrects the problem, giving the engine what it needs. Improves turbo response and high air flow ability.

High flow air filters are recommended to complete these performance kits.