This is a FACTORY REPLACEMENT 2008 4.7L Intake manifold. It can be used on Previous years with the use of a throttle body adapter. 2006-2007 may require an EGR delete and SCT tune.
The Adapter will allow you to mount the Older 3-bolt pattern throttle body to the new 2008 4-bolt pattern. JEEP OWNERS PLEASE SEE "MODIFICATIONS"
The original 4.7L's had 510mm intake runners. The HO intake when it cam out had 415mm intake runners. When the intakes were made common in 2003-2004 all 4.7L's got the 415mm HO intake runner lengths.
The 2008 4.7L intake has 350mm long intake runners and it will make the most HP of any 4.7L intake manifold. The 2008 4.7L cams are also good for over 305 SAE corrected flywheel HP.
The original HO lost core design flows more air and makes more power than the later common shell mold design, even though they both have 415mm intake runner lengths.
Original 4.7L SO intake has 510mm (20.0787 inches) intake runners and is a lost core design.
Original 4.7L HO intake has 415mm (16.3386 inches) intake runners and is a lost core design.
Common 4.7L SO/HO intake has 415mm (16.3386 inches) intake runners and is a shell mold design.
2008 4.7L intake has 350mm (13.7795 inches) intake runners and I'm unsure of the exact design.
The shorter the intake runners the stronger the top end HP. The HO intake manifold with it's 415mm long runners falls on it's face above 5200 RPM.
The 2008 4.7L intake manifold with it's 350mm long runners will pull strong to 5600-5800 RPM (not exactly sure of the final rev limiter.)
2008 4.7L - This intake is a direct factory replacement throttle body.
2006-2007 4.7L engines with EGR - We had one customer who owns a 4.7 Jeep Grand Cherokee and he had an issue preventing him from installing this intake on his Jeep. There was a canister mounted on the back of the drivers side head... It prevented him from mounting the 2008 Intake. I believe this is the EGR port as its mounted directly above the EGR hole on the head. We will look into this BUT it appears you may need to run an EGR off of a Ram, Dakota or Durango in order to fit this intake to your JEEP. Still unclear at this moment though.
It appears that the EGR on the 2006 UP 4.7L is in the way. If you have SCT then you can have the EGR tuned out and simply remove the EGR and install a block off plate in place of it... this would allow you to run the 2008 Intake.
