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4th Gen 6.7 Cummins | 2013 – 2018

2013-2018 6.7 Cummins Performance Parts | Fourth Gen Ram

Refined Power with Massive Torque Capability

The 2013-2018 6.7L Cummins represents the most refined iteration of the fourth-generation platform, featuring increased factory power, improved emissions systems, and the option of the legendary Aisin AS69RC transmission.

This generation offers exceptional power potential (500-900+ HP), outstanding towing capability, and modern refinement. Our performance parts deliver 200-300°F cooler EGTs, maintain or enhance factory features, and unlock the serious performance this advanced engine was designed for.

Advanced 6.7L Platform

Most refined 6.7L with highest factory power

200-300°F Cooler EGTs

Critical thermal management for reliability

Aisin Trans Option

Legendary Aisin handles serious power

500-900+ HP Capable

Highest potential modern Cummins platform

2013-2018 6.7 Cummins Platform Specifications

  • Engine code: ISB 6.7L (408 cubic inches), 24-valve common rail
  • Fuel system: Bosch high-pressure common rail (29,000+ PSI), CP4.2 injection pump (CP3 conversion popular)
  • Factory power: 370-385 HP / 800-850 lb-ft (2013-17), 370-400 HP / 850-930 lb-ft (2018)
  • Stock turbo: Holset HE300VG variable geometry turbo
  • Chassis: Ram 2500/3500 fourth generation (2010-2018 body style)
  • Transmissions: 68RFE 6-speed automatic, Aisin AS69RC 6-speed automatic (2013+), or G56 6-speed manual
  • Emissions: Full EPA compliance (DPF, EGR, SCR/DEF with advanced controls)

Popular Upgrade Paths for 2013-2018 6.7 Cummins

Daily Driver / Heavy Towing (500-600 HP)

VGT turbo upgrade or S300 single + EFILive + 5" exhaust. Keep exhaust brake or gain response. 150-225°F cooler EGTs, leverage Aisin strength.

Performance / Serious Towing (600-750 HP)

S400 single or S300/S400 compounds + custom EFILive + injectors. Aisin handles this power stock. 200-275°F cooler EGTs.

Competition / Extreme Power (750-1000+ HP)

S400/S400 compounds + dual CP3 + big injectors + studs. Built Aisin for ultimate reliability. 250-300°F cooler EGTs at extreme power.

Why 2013-2018 6.7L Excels: This generation combines the highest factory power output (up to 930 lb-ft in 2018), most advanced emissions controls, and the option of the bulletproof Aisin transmission. The platform is exceptionally strong from the factory and responds incredibly well to modifications. Perfect for those wanting modern technology with serious performance capability.

Shop by component: Turbo Systems | Exhaust Manifolds | Compound Kits | Turbonator® VGT Upgrades

Dodge / Ram Cummins 4th Gen (2013–2018) FAQs

The 2013-2018 generation represents the most refined and powerful iteration of the 6.7L platform.

Major improvements over 2007.5-2012:

  • Power increases: Factory power grew from 350 HP / 650 lb-ft (2007.5) to 400 HP / 930 lb-ft (2018). Massive torque gains.
  • Aisin transmission option: AS69RC 6-speed automatic (2013+) handles 600+ HP stock, legendary reliability
  • Improved emissions: More advanced DEF/SCR system, better DPF regeneration strategies
  • Enhanced ECM: More sophisticated tuning, better power delivery from factory
  • Stronger internals: Continued improvements to pistons, rods, block casting

Why 2013-2018 is preferred for performance:

  • Highest factory torque of any Cummins (930 lb-ft in 2018)
  • Aisin transmission eliminates weak point (68RFE weak, Aisin strong)
  • Better factory baseline = less work to reach 600+ HP
  • Most modern platform = best resale value
  • Advanced ECM tuning capabilities

Aisin transmission advantage:

  • Stock Aisin good to 650-700 HP (vs. 68RFE weak at 450 HP)
  • Built Aisin handles 1,000+ HP reliably
  • Smooth shifts, excellent towing behavior
  • This alone makes 2013+ trucks worth premium for serious builds

Late 6.7L supports all turbo options; Aisin transmission strength enables serious power.

VGT turbo upgrades (keep exhaust brake):

  • Turbonator® VGT or upgraded HE300VG: Enhanced variable geometry
  • Power range: 500-600 HP reliably
  • Benefits: Keeps exhaust brake, tow/haul mode, emissions compatibility, 150-200°F cooler EGTs
  • Best for: Daily drivers, heavy towing, emissions compliance, want factory features
  • Supporting mods: EFILive tuning, 5" exhaust, cold air intake

S300 fixed-geometry singles:

  • S362, S366, S369: Excellent for 550-700 HP
  • Benefits: Quick spool, 200-250°F cooler EGTs, no VGT complexity, clean power
  • Limitation: Lose exhaust brake
  • Best for: Performance builds, don't need exhaust brake, want simplicity and power

S400 singles (serious power):

  • S472, S475, S480: For 700-850 HP
  • Benefits: Massive airflow, handles big fueling, competition-ready
  • Limitation: Noticeable lag below 2000 RPM
  • Best for: Competition, drag racing, sled pulling

Compound turbo systems (ultimate):

  • S300/S400 or S400/S400: For 750-1000+ HP
  • Benefits: Zero lag, 250-300°F cooler EGTs, massive power that's drivable
  • Best for: Extreme towing (30k+ lbs), competition, high-HP street trucks
  • Advantage: Aisin transmission handles compound power without upgrades to 700 HP

EGT improvements: 150-300°F depending on turbo and power level.

Stock HE300VG baseline (with aggressive tune):

  • Towing 22,000 lbs up 6% grade with 550 HP tune: 1,200-1,300°F
  • Stock turbo restrictive with big power; needs upgrade for safe temps

After Turbonator® VGT or upgraded HE300VG:

  • Same load, same tune: 1,050-1,150°F (150-200°F cooler)
  • Improved vane design and flow = lower temps
  • Keeps exhaust brake for mountain safety

After S366 or S369 fixed-geometry single:

  • Towing 25,000 lbs, 600 HP: 1,025-1,125°F (175-250°F cooler)
  • Significantly more airflow capacity = cleaner combustion

After S300/S400 or S400/S400 compounds:

  • Towing 30,000 lbs, 750+ HP: 975-1,075°F (225-300°F cooler)
  • MORE weight, MORE power, yet dramatically cooler operation
  • This is why compounds dominate serious 6.7L builds

Why EGT control matters for late 6.7L:

  • High factory torque (930 lb-ft) means lots of fuel being burned
  • Advanced ECM tuning can add power quickly; must add air to match
  • Lower EGTs critical for head gasket longevity at high cylinder pressures
  • Cooler operation extends all component life significantly

Safe EGT guidelines for 2013-2018 6.7:

  • Cruising: Under 1,000°F ideal
  • Towing: 1,000-1,150°F acceptable
  • Max short bursts: 1,250°F for passing (brief only)
  • Danger zone: Sustained 1,300°F+ risks damage

Generally very reliable; a few known issues to address.

CP4 injection pump failure (all years):

  • Issue: CP4.2 pump catastrophic failure sends metal through fuel system
  • Cost to repair: $10,000-18,000 (pump, injectors, lines, tank cleaning)
  • Prevention: Dual CP3 conversion eliminates CP4 risk, adds power ($2,500-4,000)
  • Many owners: Convert to dual CP3 preventatively, especially for performance builds

Emissions system issues:

  • DPF clogging: Regen cycles, potential failures ($2,000-4,000 replacement)
  • DEF system: Heater, sensor, injector failures ($600-2,500)
  • EGR cooler: Can develop leaks ($1,000-2,500)
  • Reality: Many performance owners delete emissions for reliability

Transmission (68RFE only):

  • Issue: Weak with any power additions
  • Solution: Build it ($4k-10k) or buy Aisin-equipped truck
  • Aisin: Very reliable, rare issues even at high power

Lift pump:

  • Issue: Stock system marginal for high-power builds
  • Solution: Aftermarket lift pump ($600-900)

Exhaust manifold:

  • Issue: Can crack with high EGTs and power
  • Solution: Performance manifold (included in our turbo kits)

Grid heater:

  • Issue: Element or relay can fail
  • Solution: Replace or delete with block heater ($150-500)

Overall: Address CP4 (dual CP3 conversion), maintain emissions or delete, these trucks extremely reliable. Many exceeding 300k-500k miles.

Absolutely; best daily driver Cummins platform especially with Aisin.

Why 2013-2018 excels for daily use:

  • Most refined: Quietest, smoothest, most comfortable Cummins generation
  • Massive torque: 850-930 lb-ft stock makes everything effortless
  • Aisin transmission: Smooth, intelligent shifts, handles power gracefully
  • Modern amenities: Best interior, technology, comfort of any Cummins truck
  • Instant power: High-pressure injection + huge displacement = immediate response

Daily driving by power level:

Mild (525-600 HP, VGT upgrade or S300):

  • ✓ Drives like muscular stock truck
  • ✓ Excellent fuel economy (14-18 MPG highway)
  • ✓ Aisin handles power effortlessly
  • ✓ VGT keeps exhaust brake
  • ✓ Perfect daily driver configuration

Moderate (650-750 HP, S400 or compounds):

  • ✓ Very drivable (compounds eliminate lag)
  • ~ Fuel economy 12-16 MPG
  • ✓ Aisin still stock or minor upgrades
  • ✓ Incredible when you need power

High performance (800-1000 HP, full build):

  • ✓ Daily drivable with compounds
  • ~ Fuel economy 10-14 MPG
  • ~ Built Aisin recommended
  • ✓ Insane capability available instantly

Real-world daily experience:

  • Cold starts: No issues; starts easily in any weather
  • Idle: Very smooth and quiet (most refined Cummins)
  • City driving: Massive low-end torque, easy to drive gently
  • Highway: Quiet, comfortable, pulls effortlessly
  • Aisin shifts: Smooth, intelligent, adapts to driving style
  • Overall: Most modern, comfortable, refined Cummins for daily use

Fuel economy competitive with earlier generations despite more power.

Stock 2013-2018 6.7 baseline:

  • Highway (conservative): 16-20 MPG
  • Mixed driving: 14-17 MPG
  • Towing 15k lbs: 10-13 MPG
  • Emissions delete: Improves 2-4 MPG (no regen burning fuel)

Mild mods (turbo, tune, 550 HP):

  • Highway: 14-18 MPG (deleted), 13-16 MPG (emissions)
  • Mixed: 12-15 MPG
  • Towing: 10-13 MPG

Moderate builds (700 HP, injectors):

  • Highway: 12-16 MPG
  • Mixed: 10-13 MPG
  • Towing: 8-11 MPG

High-performance (850+ HP, compounds):

  • Highway: 10-13 MPG
  • Mixed: 9-11 MPG
  • Towing: 7-10 MPG

Factors affecting fuel economy:

  • Emissions equipment: DPF regen biggest fuel economy killer; delete helps significantly
  • Driving style: Massive torque tempts heavy throttle use
  • Tuning: Aggressive tunes prioritize power over economy
  • Injector size: Bigger injectors make fuel more accessible
  • Weight/aero: Heavy trucks with lifts and big tires suffer

Aisin vs 68RFE economy: Aisin typically 1-2 MPG better due to more efficient gear ratios and smoother lockup strategy.

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