DAP G3 S366 66/73/14 Billet Turbo

Q: What is the difference between the S366 66/73/14 and the S364 64/73/14?

Both use the same 73mm Inconel turbine and 14cm gated housing. The S366 66/73/14 uses a 66mm billet compressor inducer for builds that have pushed past the S364 compressor ceiling. The S364 64/73/14 uses a 64.47mm inducer and is correct for 600-625HP. Choosing the S366 on a build that does not need the extra flow will result in slower spool without meaningful power gains.

DAP G3 S364 66/73/14 Billet Turbo - 03-07 Dodge 5.9L Cummins

DAP G3 S366 66/73/14 Billet Turbo - 2003-2007 Dodge 5.9L Cummins

Available Options

Wastegate Fooler (Required for 04.5-07 Trucks)

$1,199.00

Part Number: DAP-G3S3667314G44T3
Est. Ship Time: Usually Ships By Next Business Day

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Cannot Ship to California or Colorado.
This turbocharger cannot be sold or shipped to California or Colorado addresses. Do not place this order if your shipping address is in either of those states.

2004.5-2007 Owners: Electronic Wastegate Fooler Required.
Installing this aftermarket turbo on a 2004.5-2007 Dodge Ram 5.9L Cummins requires the DAP-EWF Electronic Wastegate Fooler. Without it, the truck will throw a fault code when the factory wastegate is unplugged. The DAP-EWF is available as an add-on option in the dropdown when ordering.

The DAP-G3S3667314G44T3 is a G3 billet S300-based turbocharger for 2003-2007 Dodge Ram 5.9L Cummins builds pushing past 625HP. With a 66/73/14 configuration - 66mm billet compressor wheel and 73mm Inconel turbine in a 14cm gated housing - this steps up the compressor inducer over the S364 family while pairing it with the same large-frame 73mm turbine. This is a high-ceiling turbo for builds that have genuinely outgrown the 64mm compressor map.

Is This The Right Turbo For Your Truck?

Buy this if you have a 2003-2007 Dodge Ram 5.9L Cummins and your build has genuinely outgrown the S364 64/73/14 - you need the larger 66mm compressor map to support your power target.
Do not choose this if your build is at or below 625HP - the S364 64/73/14 is the correct match for that range and will respond faster on a build that is not fully utilizing the S366 compressor map.
Do not choose this if you want a stock-style replacement - this is a purpose-built high-output performance upgrade, not a factory-style restoration part.
Do not choose this if you are on a 2004.5-2007 truck and have not added the DAP-EWF wastegate fooler - add it in the dropdown before ordering.
Verify before ordering: confirm your truck year (2003-2007), confirm the T3 manifold flange, and confirm whether you need the DAP-EWF based on your model year.

S366 66/73/14 vs S364 64/73/14 - When To Step Up The Compressor

Both the S366 66/73/14 and the S364 64/73/14 share the same turbine side: 73mm Inconel wheel and 14cm gated housing. The difference is the compressor inducer - and that difference defines which build this turbo belongs on.

S366 vs S364 - Compressor Split
S366 66/73/14 (this turbo): 66mm billet compressor inducer - larger compressor map for builds that need airflow beyond what the 64mm wheel can supply.
S364 64/73/14: 64.47mm billet compressor inducer - correct for 600-625HP where the 64mm map has headroom to spare and spool response is sharper.

Buy the S366 when your build has genuinely pushed past the S364 compressor ceiling. Stay with the S364 64/73/14 if you are targeting 600-625HP and want the quickest spool response that turbine size allows.

A larger compressor inducer on a build that does not need the extra flow will spool slower and feel lazier on the street without adding meaningful top-end power. Match the compressor to your actual build target - not your future goals.

The 2004.5-2007 Wastegate Fooler Requirement

Starting in 2004.5, Dodge equipped the 5.9L Cummins with an electronically controlled wastegate on the HE351CW. When you remove the stock turbo and install an aftermarket unit, the factory wastegate connector has nothing to plug into. The ECM sees this as a fault and throws a code.

The DAP-EWF plugs into the factory wastegate connector and prevents that fault code. It is available as an add-on option in the dropdown on this page. Add it before checkout if your truck is a 2004.5-2007. If your truck is a 2003, the DAP-EWF is not required.

2003 vs 2004.5-2007:
2003: No electronic wastegate - DAP-EWF not required.
2004.5-2007: Electronic wastegate present - add DAP-EWF in the dropdown before checkout.

Fitment Coverage

2003-2007 Dodge Ram 5.9L Cummins
T3 inlet flange
HX40 exhaust outlet
2004.5-2007 trucks require DAP-EWF Electronic Wastegate Fooler (available in dropdown)
Cannot ship to California or Colorado

This turbo does not fit pre-2003 or post-2007 5.9L Cummins applications.

Cross Reference Part Numbers

13009097049
Borg Warner SXE
Borg Warner SX-E

Avoid These Common Mistakes

Do not install on a 2004.5-2007 truck without the DAP-EWF wastegate fooler. The fault code appears as soon as the factory wastegate connector is disconnected. Add it in the dropdown before ordering.
Do not choose the S366 66/73/14 for a build that has not outgrown the S364 64/73/14 compressor map. The larger 66mm inducer spools slower on builds that do not need the extra airflow. Match the compressor to your actual power target.
Do not assume T4 manifold compatibility. This is a T3 inlet flange. Confirm your manifold flange type before ordering.
Do not order for a pre-2003 or post-2007 5.9L Cummins. Fitment is specific to the 2003-2007 model year range.

Before You Order - Final Check

Truck confirmed as 2003-2007 Dodge Ram 5.9L Cummins
Manifold flange confirmed as T3
Build confirmed as having outgrown the S364 64mm compressor map - not simply targeting 600-625HP
If 2004.5-2007: DAP-EWF Electronic Wastegate Fooler added to order in the dropdown
Shipping address is not California or Colorado

Checklist confirmed? The DAP-G3S3667314G44T3 is the right billet S366 66/73/14 for your high-output 2003-2007 5.9L Cummins build.

Frequently Asked Questions

Click or tap a question below to expand the answer.

What is the difference between the S366 66/73/14 and the S364 64/73/14?

Both use the same turbine side - 73mm Inconel wheel and 14cm gated housing. The difference is the compressor. The S366 66/73/14 uses a 66mm billet compressor inducer for builds that have pushed past the S364 compressor ceiling. The S364 64/73/14 uses a 64.47mm inducer and is the correct choice for 600-625HP builds where the 64mm map still has headroom. Choosing the S366 on a build that does not need the extra compressor flow will result in slower spool without meaningful power gains.

Do I need the DAP-EWF wastegate fooler for my 2005 5.9L Cummins?

Yes. Any 2004.5-2007 Dodge Ram 5.9L Cummins requires the DAP-EWF Electronic Wastegate Fooler when installing an aftermarket turbo. The factory HE351CW on those trucks has an electronic wastegate - when you unplug that connector during install, the ECM sees it as a fault and throws a code. The DAP-EWF plugs into the factory connector and prevents that code. It is available as an add-on option in the dropdown on this page.

Does a 2003 5.9L Cummins need the wastegate fooler?

No. The 2003 model year does not have the electronic wastegate introduced in 2004.5. A 2003 truck can install this turbo without the DAP-EWF.

Is this a T3 or T4 inlet flange?

This is a T3 inlet flange. If your exhaust manifold is T4, you will need a matching T4 manifold or a T3-to-T4 adapter. Confirm your manifold flange type before ordering.

Is this a stock replacement or a performance upgrade?

This is a performance upgrade. The 66mm billet compressor and 73mm Inconel turbine are sized for high-output builds that have genuinely pushed past what the S364 compressor map can support. If your goal is a stock turbo replacement, this is not the right part.

Does this turbo fit a pre-2003 or post-2007 5.9L Cummins?

No. This turbo is specific to the 2003-2007 Dodge Ram 5.9L Cummins platform. For pre-2003 applications, see the DAP G2 S300 lineup. For post-2007 applications, a different turbo is required.