What’s the difference between 4-inch and 5-inch exhaust systems for 6.7 Cummins?

For 2013–2018 Ram 6.7L Cummins trucks, a 4-inch DPF delete pipe provides balanced backpressure for daily driving, while a 5-inch system maximizes exhaust flow and reduces EGTs for high-performance builds.

Is this 6.7 Cummins delete pipe stainless steel?

Yes. This SPELAB Ram 6.7 Cummins DPF delete pipe with muffler is made from T-409 stainless steel, which is magnetic but provides strong corrosion resistance and durability.

How thick is the pipe and is it durable?

The exhaust pipe uses 2 mm thick T-409 stainless steel construction, ensuring long-term durability and heat resistance for Ram 2500HD and 3500HD diesel trucks.

Will this muffled DPF delete improve performance?

Yes. Installing this SPELAB 2013–2018 Ram 6.7 Cummins DPF delete pipe with muffler reduces exhaust restriction, lowers EGTs, improves turbo spool, and can increase fuel efficiency when paired with proper tuning.

Is this 6.7 Cummins DPF delete pipe with muffler street legal?

No. Removing emissions equipment such as the DPF is illegal for public-road use in many regions. This SPELAB Ram 6.7 Cummins DPF delete pipe is intended for off-road or competition use only.

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4-inch stainless DPF delete race pipe with a cylindrical muffler, triangular bolt-on flange, welded spring hanger, and stepped exhaust tip, for 2013-2018 Dodge Ram 2500/3500 6.7L Cummins, beside a SPELAB DPF pipe box.

DPF delete race pipe kit with two stainless band clamps, a straight pipe, a cylindrical muffler body, a flanged pipe with welded spring hanger, and a hanger bracket, for 2013-2018 Dodge Ram 2500/3500 6.7L Cummins.

Zinc-plated exhaust hanger bracket with two bent rod arms ending in ball studs and a circular band clamp secured by two bolts, for the 2013-2018 Dodge Ram 2500/3500 6.7L Cummins DPF delete race pipe.

For 4'' DPF Delete Race Pipe w/Muffler for 2013-2018 Dodge Ram 6.7L Diesel | SPELAB

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Selected Variant SKU: SPES08112

$279.00

~~$388.00~~ -28% $279.00

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For 4'' DPF Delete Race Pipe w/Muffler for 2013-2018 Dodge Ram 6.7L Diesel | SPELAB

$279.00

~~$388.00~~

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Product Information +

Brand: SPELAB
SKU: SPES08112
Availability: Many in stock
Product Type: DPF & Cat Delete Pipe
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Unlock your 2013-2018 Dodge Ram 6.7L diesel's true potential with this high-performance DPF delete pipe. Our precision-engineered solution eliminates restrictive factory filters, dramatically reducing exhaust gas temperatures (EGTs) while improving turbo spool-up and throttle response. The mandrel-bent construction ensures maximum flow efficiency, helping your diesel breathe easier. Perfect for off-road enthusiasts seeking better power delivery and reduced maintenance hassles.

Specification

Exhaust Material	T-409 Stainless Steel, it is magnetic.
Thickness	2mm thick for long-lasting durability and heat resistance.
Inlet Diameter	4.0"/5.0‘’
mandrel-bent construction	Maximum flow efficiency, helping your diesel breathe easier

Benefits

Expect to see a significant increase in fuel mileage. If your DPF is plugged up your probably averaging about 13-14 mpg. More or less depending on the severity of the restriction. After deleting the DPF/CAT expect to get a combined mileage of 18-19 mpg.

It removes the need to service the DPF at regular intervals (cleaning, replacement)
A DPF delete will remove the possibility of a DPF failure which could cause expensive diesel repairs
Due to less exhaust backpressure, the DPF delete increases exhaust flow and therefore increases the performance of your motor!
Paired with an ECU remap, the DPF delete is proven to increase power and torque for all vehicles

Installation

Install takes about 1hr with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be be required to fit shorter wheelbase bed/cab configurations. Clamps, hangers and hardware are included. You may have to re-use some factory hardware.
Tuner Required: Removal of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.

2013-2018 Dodge Ram 2500HD 3500HD 6.7 Diesel. Crew cab short bed, crew cab long bed & mega cab.
This will not fit the Cab & Chassis commercial-style truck. Will not fit trucks with air-ride suspension.
If you are looking for DPF Delete for 13-18 Dodge Ram 6.7L diesel Cab & Chassis <- Click here

Dodge Ram DPF Delete Pipe | Duramax DPF Delete Pipe | Ford Powerstroke DPF Delete Pipe | All DPF Delete Pipe

Q1. What’s the difference between 4" and 5" exhaust systems?

4" – Better for mild/moderate tunes, retains some backpressure for low-end torque.
5" – Best for high-horsepower builds, maximizes flow for reduced EGTs and top-end power.

Q2. Will a magnet stick to this pipe? Is it really stainless steel?

Yes – This pipe uses T-409 stainless steel, which is still magnetic (unlike T-304). It offers excellent corrosion resistance while being more affordable than T-304.

Q3. How thick is the pipe? Will it last?

2mm thick T-409 stainless steel – Durable enough for long-term use without excessive weight.

Q4. Will this improve performance?

Yes! Benefits include:

Lower EGTs (Exhaust Gas Temperatures)
Faster turbo spool
Better fuel efficiency (with proper tuning)
No more DPF clogging issues

Q5. Is this street legal?

⚠ Off-Road Use Only – DPF removal is illegal for on-road vehicles in most regions. For competition/racing use only.

Fast Shipping Policy

Your order will be dispatched within 1–2 business days, and your package will arrive within the estimated delivery window shown at checkout. View Shipping Policy

Easy 30-Day Return Policy

You may request a return or exchange within 30 days of delivery. Items must be returned in their original, undamaged condition. Return shipping costs are the customer's responsibility. For damaged, incorrect, or defective items, please contact us as soon as possible for assistance. View Return Policy

5 stars: 27 (87%)
4 stars: 4 (13%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Happy

Wish I would have done the delete sooner! Once you get your old exhaust out, the entire kit to install was pretty simple. Woke my engine up and pleased with fuel mileage and power. Muffler has a decent tone and really happy I didn’t do straight pipe. It was have been too loud especially when towing. Pleased with kit and would recommend. Gotta put phone to ear to hear truck over dogs barking in video I attached

Ram exhaust

Overall pretty good, only issue was rear hanger didn’t align with factory hangers on vehicle. Ended up using 2 rubber hangers on one side.

Great fit

Highly recommended if you like mid tone sound without the restrictions, recommend to have it installed by a muffler shop also make sure you have a new gasket for the flange

For 4'' DPF Delete Race Pipe w/Muffler for 2013-2018 Dodge Ram 6.7L Diesel | SPELAB

4" exhaust with muffler

Product is great, sounds great. When you purchase with muffler there should be instructions on where to cut new pipes so hanger bracket is in the correct location. I missed that detail on install.

We just installed kit and I really like the sound of truck with new pipe .

Worked out awesome

Works awesome , nice rumble and throaty when you get on it ….

Delete exhaust

Really great quality fit great easy to install

For 4'' DPF Delete Race Pipe w/Muffler for 2013-2018 Dodge Ram 6.7L Diesel | SPELAB

4” race pipe with muffler

I installed the race pipe with muffler on a 18 Cummins, very nice kit ,exactly what I needed, don’t have to worry about drone in the cab but still have that nice diesel sound

For 4'' 2013-2018 6.7 Cummins DPF Delete Race Pipe w/Muffler | SPELAB

DPF delete kit with 30" muffler

Worked like a Champ!

Sounds

Has a great sound with low tones

4" race pipe w/ muffler

Product fits very well. Cutting was required to get to proper length. Good quality, and I even bought a second one for my other truck.

2013-2018 6.7 Cummins DPF Delete Race Pipe w/Muffler

For the price you can't beat the quality and the fit. All I needed to do was fit a piece of the pipe to the muffler and tailpipe to finish the system.

Fit perfectly

Good quality parts easy to install.
They got excellent aftermarket parts

6.7 Cummins DPF Delete Race Pipe w/Muffler

Works Great! Would do it again!

4" delete pipe and muffler

The quality of the parts where fantastic. The only issue I had was determining where to cut the pipes to fit the muffler. After measuring 4 times and cutting once. It git like a charm and I love the sound it produces. I don't like loud at my age anymore.

Thanks for the review and I look forward to receiving pictures of your installation feedback!

Good enough

Decent product,I would buy it again but Some instructions would be nice

Thanks for the review and I look forward to receiving pictures of your installation feedback!

4'' 2013-2018 6.7 Cummins DPF Delete Race Pipe w/Muffler | SPELAB

No gasket for down pipe flange

Pipe fit great bolts were perfect, just wish it woulda came with a down pipe flange gasket, woulda saved me a trip to the parts store

Thanks for your comment, we'll get back to our developers with your suggestions! Looking forward to receiving feedback pictures!

I love it!

I appreciate the prompt delivery and am very happy with the installation and product. I have a new power train!!