that answer my firewall question Damian
yep and im interested due to the fact i cruise about 2400-2500rpms for a better part of 9 hours a day... due to rpm and the engine being .020 over it would probably help... if they fitI just wanted to clarify one thing....
Malibu795 has a converted truck that he has installed a Duramax into. He is asking for details/fitment info to see if they will work in his custom application. These manifolds and up-pipes are specifically designed to fit the 2500/3500HD trucks.