BigBearTuning is an industry leader in Cummins ECM delete tuning — trusted by truckers, fleet operators, and heavy equipment owners across North America.
We support all Cummins engines including ISX, ISX15, ISX12, X15, and X12 in:
• Kenworth
• Peterbilt
• Freightliner
• Heavy Equipment & Off-Road Machinery
All ECM generations supported:
CM871 - CM2250 - CM2350 - CM2350A - CM2450
Remote Tuning Requirements:
Diagnostic Adapter
(Nexiq USB Link, Cummins Inline, DPA5, Noregon...)
Windows laptop
Internet Connection
What’s Deleted:
✅ DPF
✅ EGR
✅ SCR
✅ DEF
All emission-related sensors and components are fully disabled.
Performance Upgrade:
We set power based on your engine's CPL, up to the maximum OEM-approved safe limit.
DEF gauge remains functional
Always shows level between 70–100%.
No more regens. No more warning lights. No more downtime.
• ISX ISX15 ISX12
• DPF EGR delete
• Power upgrade included(CPL based)
• ISX ISX15 ISX12
• DEF SCR EGR DPF delete
• Power upgrade included(CPL based)
• Remote tuning(over the internet)
• Max OEM approved power rating
• No diagnostic software is needed
• No regen light
• DEF shows 70-100% level - at ALL times
• Laptop/PC with Windows OS
• Diagnostic adapter (Nexiq USB-Link, DPA5, Noregon DLA, Inline)
• Internet connection
• Team Viewer (free software)
• Hollow out all filters on exhaust
• Block off EGR gas flow
We can work on any Cummins ISX (ISX12 ISX15) - X12 - X15 engine!
Any emission level - CM870 CM871 CM2250 CM2350 CM2350A CM2450.
No matter in which big rig (semi truck) it's installed!
All emission components are deleted:
DPF - DOC - EGR - DEF - SCR
FREE POWER UPGRADE to max OEM approved spec. based on CPL number!
There will be no warnings on dash, and DEF gauge will show level all the time!
Regeneration is disabled, allowing you to operate your vehicle without the hassle of DPF regeneration cycles.
DPF delete requires physical modifications to the truck's exhaust.
You’ll need to remove the entire ceramic honeycomb material from all filters in the exhaust system (DPF, DOC, SCR), or alternatively, straight-pipe the exhaust.
Failure to perform these modifications can lead to exhaust clogging, which may result in reduced power and potential engine damage.
Delete and remove DEF SCR systems on Cummins ISX - X15 - ISX15 - ISX12 - X12!
DEF dosing/doser/injector disabled!
DEF tank level and temperature sensors are no longer need and can be removed!
All ECM generations supported CM2250 CM2350 CM2350A CM2450.
Any vehicle brand or type!
DEF analog and digital gauges supported and will show level between 70-100%.
EGR delete tuning for Cummins ISX - X15 - ISX15 - ISX12 - X12!
Your engine will use only clean air, resulting in better performance and improved fuel economy.
All ECM generations supported CM870 CM871 CM2250 CM2350 CM2350A CM2450.
Any vehicle brand or type!
After deleting the EGR, the EGR gas flow must be blocked off with steel plates.
This step is essential to prevent exhaust gases from leaking back into the intake, which can cause combustion issues.
Failing to block off the EGR can result in rough engine operation, excessive smoke, and reduced performance.
Every delete tune comes with a FREE power upgrade!
We set the power to the maximum OEM-approved rating based on your Engine Serial Number.
Power is set according to Cummins-approved specifications, with the CPL (Control Parts List) number as our primary reference.
Perfect for fleets and daily drivers, offering a safe and reliable performance boost.
