Cummins 3923178 — Genuine Compressor Outlet Elbow (Air Transfer Pipe) for 5.9L

MPN: 3923178  |  Also Known As: compressor outlet elbow, turbocharger elbow, air transfer pipe  |  Associated Hardware: Clamp 3923060 / 3069053, O-ring 3883284

Genuine Cummins elbow that connects the turbocharger’s compressor outlet to the intercooler tube on HX35/HY35/HX40-equipped 5.9L trucks. Direct-fit for 1994–2002 Ram 5.9L Cummins (12V & 24V). One end is V-band to the compressor cover; the other end accepts a 3.0" intercooler hose. Elbow only; clamp and O-ring sold separately.

Features & Benefits

• OE geometry for proper charge-air alignment and sealing.
• Direct-fit replacement on HX35/HY35/HX40 applications (select S300 variants with matching V-band).
• V-band connection for quick service and reliable retention.
• 3.0" hose interface to match factory intercooler plumbing.
• Built to Cummins standards for durability and fit.

Verified Fitment (Automotive)

Industrial/Off-Highway: Common on BS3 B-Series 5.9L applications (4BT/6BT/ISB) — verify by ESN before ordering.

Specifications

• Type: Turbo compressor outlet elbow (air transfer pipe)
• OE Part Number: 3923178
• Turbo Compatibility: HX35 / HY35 / HX40 (select S300 variants with OE-style V-band)
• Outlet Size: 3.0" hose interface
• Quantity Required: 1 per vehicle (sold individually)

Often Paired With

• Clamp: 3923060 / 3069053 (V-band, compressor outlet)
• O-ring: 3883284 (compressor outlet flange)
• 3.0" intercooler hose & clamps (as needed)

What’s In The Box

• (1) Genuine Cummins Compressor Outlet Elbow (3923178)
• Clamp and O-ring sold separately (see “Often Paired With”).

Installation Tips

• Inspect the compressor cover groove and replace the 3883284 O-ring whenever the elbow is removed.
• Use the correct 3923060/3069053 V-band clamp and ensure the elbow is fully seated before tightening.
• Verify intercooler tube alignment and hose condition; replace aged 3.0" couplers.

FAQ

WILL THIS FIT MY 1994–2002 5.9L CUMMINS RAM?

Yes—this is the factory-style compressor outlet elbow for 1994–2002 Ram 2500/3500 with HX35/HY35/HX40 turbos. Confirm by VIN/ESN if unsure.

WHAT HARDWARE DO I NEED?

You’ll need the compressor outlet V-band clamp (3923060/3069053) and the outlet O-ring (3883284) for proper sealing.

WILL THIS WORK WITH AN S300 TURBO?

Yes on many S300 variants if the compressor cover is machined for the OE V-band and uses the 3.0" outlet; otherwise use the elbow provided with your turbo kit.

IS THIS A GENUINE CUMMINS PART?

Yes—OE Cummins part 3923178 (Cummins calls it an “air transfer pipe”).

WHAT SIZE INTERCOOLER HOSE DOES IT USE?

3.0" inside diameter hose on the tube side.