PPE High Flow Exhaust Manifolds with Up-Pipes-50 State Legal 01-04 GM 6.6L Duramax LB7 MACS-513208 aiding the injection system by

aiding the injection system by reducing the amount of work your factory injection pump has to perform

Even the stock wiring harness can be used for easy plug in

64mm (actual measurement 63

The professionals at ICON Vehicle Dynamics were one of the first key companies that determined what upgrades would create a harmonious package for unrivaled performance

PPE High Flow Exhaust Manifolds with Up-Pipes-50 State Legal 01-04 GM 6.6L Duramax LB7 MACS-513208 aiding the injection system byIntroducing high flow performance for your Duramax that is 50 state legal! The factory manifolds and up pipes on the GM Duramax's have several design flaws that reduce potential exhaust flow. One of the larger draw backs is that the drivers side manifold has a large indentation in it for excessive clearance tolerances that is unnecessary. Secondly, the factory up pipes are weak and prone to warping when sustained heat is prevalent. Replacing your