Acufab Intake Elbow hitting hood.

[Jorkon]

I installed the acufab intake elbow and just the other day when I was changing my oil I noticed that it was touching the hood insulation and some of the insulation is now burnt onto the top of the elbow and even lightly melted some of the boot coneting the elbow to the pipe. My question is are the 03 and 04 elbows different from the 05 to 07?

[gameboynws]

05+ Intake Elbow on 03-04 Superduty - The Diesel Garage Forums

[shu873]

Yes the 03-04 & 05+ are slightly different. IIRC from accufab, they recommend trimming some of the hood insulation on an 03 truck when installing their elbow.

[ShawnCT450R]

The difference is the 03/04 has a large butterfly valve manifold that mounts underneath the elbow. Not sure what it's for. I purchased an innovative diesel elbow for an 05 & up truck, removed that crappy butterfly manifold (upon recommendation from someone knowledgable), and put the elbow in the truck. Runs great. That butterfly manifold has a permenant home on the shelf in my garage. hehe

The 05 and up trucks don't have this manifold. Not sure why. Maybe one of the techs will chime in and let us know.

[gameboynws]

The valve was designed to help with the EGR system. The valve partially closes and it creates a vacuum and this vacuum helps to pull exhaust into the motor. What is more interesting is that the valve is found on 03 and 04 motors, and the valve is not in use on the 03 motors. Starting in 05 the valve was deleted. I expect to see a return of the intake valve on diesels with ever increasing emissions regulations. For example the new 08 Duramax come equipped with an intake valve, all in the name of emissions. From what I have read about the new Duramax, the computer closes the valve to help with the EGR system and to increase EGTs.