// Install guides
EXHAUST & DPF/SCR DELETE — READ THIS FIRST
The SCR and DPF are deleted together and must be done with a DPF-delete-capable tuner. Fit the pipe without the tune and the truck will not run right.
What to know before and after ordering a delete exhaust: what the SCR and DPF do and why they come out together, choosing the right pipe for a RAM Mega Cab or a split-year 2015 Duramax, and what to expect when the box arrives. Removing the SCR also means you no longer run diesel exhaust fluid (DEF).
Steps
1 What the SCR system is
Selective catalytic reduction (SCR) is fitted to the 2011+ Duramax LML, the 2013+ Cummins 6.7L and the 6.7L Power Stroke. Diesel exhaust fluid (DEF) is injected into the SCR catalyst, where it converts nitrous oxides into water and nitrogen, which in turn reduces how often the EGR and DPF have to regenerate.
When the truck is new with low miles the system works well. Once the DPF and SCR start giving trouble, repairing them costs thousands and they can fail again down the road. Removing them is one of the best things you can do for the truck's reliability, and it ends the need to run DEF.
2 Why the DPF and SCR come out together
The delete pipe replaces the DOC, DPF and SCR as one assembly, so they are removed together. It must be done with a DPF-delete-capable tuner running an emissions-removed tune; the pipe alone does nothing useful.
3 Am I missing a hanger?
Almost certainly not. A delete exhaust is far lighter than the factory particulate filter it replaces. With that weight gone the extra hanger is no longer needed, so the kit does not include one.
4 RAM Mega Cab: which delete pipe do I need?
The Dodge RAM Mega Cab uses the same DPF delete pipe as the short bed and the crew cab long bed. When you make your selection, choose Normal Pickup.
5 2015 or 2015.5 Duramax LML: check your clamp style
2015 was a split year for the Duramax. On 2011–2015 trucks the downpipe attaches to the turbo-direct pipe with a V-band clamp. On 2015.5–2016 trucks it attaches with a 3-bolt flange. Look under the truck and confirm which you have before ordering.
6 Stainless exhaust rusting: T-409 vs T-304
Most stainless exhaust systems on the market, and every stainless kit we sell unless it says T-304, are T-409 stainless. Depending on road conditions and climate, T-409 picks up surface rust after a few months or years. An occasional clean with a Scotch-Brite pad keeps it in check.
The only way to avoid rust altogether is a T-304 mirror-finish system, which typically costs two to three times as much.
7 Shipping damage: make it work vs a claim
Shipping an 80 lb box across the country has its downsides, and sometimes the ends of pipes arrive bent. In most cases a large crescent wrench puts them right in a minute. If a system arrives beyond repair, let us know and we will get it taken care of.
8 Only part of my order arrived
We ship from several fulfilment centres, distributors and manufacturers across the United States and Canada, so items on one order often arrive separately. The exhaust is usually last: most are built to order and can take up to 10 business days to ship. Tracking is uploaded as soon as each item leaves.