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External Engine Parts

Grid heater delete, radiator hoses, breathers, and more! From Cummins, Glacier Diesel, BD Power, Banks, and Mopar.

2003-2007 Dodge Cummins external engine upgraded and replacement parts.

From Cummins Cummins

Cummins 2003 and up OEM Harmonic Balancer Dowel. Cummins part number: 3946495


From Cummins Cummins

Cummins 4935281

Includes sealing o-ring.


From Cummins Cummins

Valve Cover Bolts with O-Rings. 6 Bolts, 6 O-Rings
Fits 2003-2005 common rail engines.

Part number:  
6x3900633, 6x3087740

Number 1 & 2 in image only.


From Cummins Cummins

Rocker Box for 5.9L Cummins Diesels 2003-2005. Includes item #17 only. Cummins part number: 3955121


From Cummins Cummins

Breather vent mounts to valve cover. Fits 2003-2005 common rail engines.

Part number:  3957987


From Cummins Cummins

Breather hoses mount to breather assembly on valve cover. Fits 2003-2005 Dodge 5.9L Common rail engines. Select which line combination you'd like in...

From Cummins Cummins

Genuine Cummins Remanufactured Cylinder Head This head uses a part number 4955212 exhaust valve  (inconel) Fully...

From Cummins Cummins

Genuine Cummins Remanufactured Cylinder Head This head uses a part number 4955210 exhaust valve (cylinder head 4931564RX...

From Cummins Cummins

Stock length turbo drain tube for the 03-07 Dodge 5.9L Commonrail Cummins diesel trucks.

Cummins: 3970875

Picture for representation only.

From Cummins Cummins

03-07.5 Dodge 24V CR Cummins Stock Exhaust Manifold Bolts (12)

Part #'s

3944593x7 & 3944655x5


'03-'07 5.9L "Air-Boss CR" Intake Plenum Cover & Grid Heater Delete Kit

EGT's running too high? Can't use all of the fuel you have available? The GDP Air-Boss intake plate gives the largest flow increase possible short of milling the cast plenum off the head and installing a fabricated intake plenum such as the ZZ Fab unit.

The Air-Boss plenum isn't just a replacement flat aluminum plate as seen in other designs. The Air-Boss is a true, elevated plate designed to flow as much air as possible to cylinders 4, 5, and 6. We've all have seen the head gasket failures between the hottest running #5 and #6 cylinders. With our plate design we open up the plenum area to the starving rear cylinder by a full 30%. By increasing airflow to the rear cylinders we reduce EGT's and allow you to run even higher fueling levels.

The Air-Boss plenum kit also includes a shortened grid heater delete block to maintain the factory IC piping to intake manifold connection geometry . Maintaining this geometry makes the Air-Boss plenum compatible with ALL aftermarket intake manifolds and the stock mounting hardware.

Grid Heater options:

A) The standard Air-Boss CR kit includes a custom height grid heater delete block.

B) For colder climates we now offer the Air-Boss CR with a grid heater option. This option uses the factory grid heater (no delete included) and custom length stainless steel studs to accomodate the increased plenum height of the Air-Boss CR.

C) For customers that want to swap back and forth between the heater and delete block we offer both item in one package.

Kit includes Air-Boss intake plate, factory gaskets, custom height grid delete block and/or optional stainless steel studs, and shortened injector line retaining brackets.

From Cummins Cummins

CLICK HERE for gaskets you will need to finish replacing you oil cooler.

Cummins: 3959031