GM Duramax LML 6.6L All-in-One DPF/DEF/EGR LML Delete Kit (2011-2016)

Introduction

The GM Duramax 6.6L All-in-One DPF/DEF/EGR LML Delete Kit (2011–2016) combines a race exhaust, full EGR/cooler delete and tuner support for off-road performance. Expect lower EGTs, freer flow, and sharper response with proper calibration. Tune the vehicle first, then remove emissions hardware.

Features

• Complete package for LML 6.6L (2011–2016): race DPF-delete pipe + full EGR/cooler delete
• Correct flange selection at checkout: V-band (2011–early-2015) or 3-bolt (late-2015–2016)
• 4" stainless race pipe reduces backpressure and heat
• Includes delete-ready tuner support (Mini Maxx Delete-Tuner listed in box contents)
• Hardware and gaskets included for clean install
• Off-road/competition use only; Pre-tuning mandatory

Benefits

• Power & torque: Freer exhaust enables stronger tune gains
• Towing: Lower EGTs under sustained load
• Drivability: Quicker spool and mid-range pull
• Efficiency: Potential mpg gains with correct calibration
• Longevity: Less soot/heat stress on cooling and exhaust systems

Compatibility

Vehicles: 

• 2011-2015 Duramax 2500/3500 LML 6.6L
• 2015.5-2016 Duramax 2500/3500 LML 6.6L

Flange types:

• V-band: 2011–Early 2015
• 3-bolt: Late 2015–2016

Exclusions: Not for Cab & Chassis. Late-2015 trucks with V-band are incompatible. Verify flange before purchase.

Technical Specifications

Exhaust (select one):

• V-band (2011 Early 2015): 4" stainless DPF-delete race pipe
• 3-bolt (Late 2015–2016): 4" stainless DPF-delete race pipe

Included EGR & cooler delete kit (LML):

• 1 × Aluminum intake block-off plate with O-rings
• 1 × Steel EGR block-off plate
• 1 × Silicone coolant hose with pre-crimped fittings
• 4 × Hose clamps
• 4 × Socket head bolts
• 5 × Hex head bolts

Box contents:

• Mini Maxx Delete-Tuner
• One 4" stainless DPF-delete race pipe matching your flange (V-band or 3-bolt)
• Full EGR valve & cooler delete kit (listed above)
• Required hardware and gaskets

Power gain range: Tune-dependent; varies by supporting mods
Operating range: Race use; sustained lower EGTs vs stock when calibrated

Installation & Notes

Order of operations: 1) Load custom tune first. 2) Confirm no DTCs/limp. 3) Remove emissions hardware and install kit.

Difficulty: Moderate. Cutting may be required to remove factory exhaust.

Fitment tips: Identify flange style before ordering; verify wheelbase/hanger locations; torque to spec; re-check after first heat cycle.

Legal: Off-road/competition use only. Not street legal. Check local, state, and federal laws.

Reminder: The vehicle must be tuned prior to deleting the emissions systems.

Frequently Asked Questions

How do I confirm my flange type?
Inspect the DPF inlet at the downpipe: a circular clamp is V-band; a triangular flange with three bolts is 3-bolt.

Does this fit Cab & Chassis LML?
No. Pickup models only.

Do I need a muffler with the 4" race pipe?
Optional. Add a 4" muffler for sound control; tuning requirements are unchanged.

Can I install this at home?
Many owners do. Basic exhaust and cooling-system work is required. Professional installation recommended if unfamiliar.

Is tuning required before hardware install?
Yes. Pre-tuning is mandatory to prevent DTCs/derates and to realize gains.