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3.7L / 4.0L Engine Upgrades

Upgrade Your 3.7L and 4.0L Engines The 3.7L V6 and 4.0L inline-6 engines are known for their durability and solid performance in various Mopar trucks and SUVs. These engines offer a reliable foundation for drivers looking to enhance power, torque, and overall capability without sacrificing everyday dependability. At FastHemis, you’ll find a range of upgrades crafted specifically for these engine platforms. From intake and exhaust improvements to ignition and fuel system enhancements, each part is designed to optimize your engine’s performance and longevity. Whether you’re aiming for better throttle response, increased towing capability, or improved efficiency, these upgrades help you get the most out of your Mopar V6 or inline-6. Popular upgrades include: - High-flow air intakes and performance exhaust components - Ignition system enhancements for stronger spark - Fuel delivery and tuning options - Cooling system improvements for sustained reliability Shop 3.7L / 4.0L engine upgrades at FastHemis.
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378 Results

DiabloSport inTune i3 Platinum Programmer: 300 / Challenger / Charger / Magnum / Ram / Durango 2005 - 2014

DiabloSport inTune i3 Platinum Programmer: 300 / Challenger / Charger / Magnum / Ram / Durango 2005 - 2014

Diablo Sport
4.8 (8)

Regular price $535.95 $475.95 11% off

Unit price
per 

Cometic MLS Head Gaskets (3.950" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025
Cometic MLS Head Gaskets (3.950" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025
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Cometic MLS Head Gaskets (3.950" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025

Cometic Gasket
5.0 (1)

Regular price from $96.54 Up to 10% off

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per 

American Brother Designs Oil Cap Cover: Chrysler / Dodge / Jeep / Ram Hemi 2005 - 2024
American Brother Designs Oil Cap Cover: Chrysler / Dodge / Jeep / Ram Hemi 2005 - 2024
usa

American Brother Designs Oil Cap Cover: Chrysler / Dodge / Jeep / Ram Hemi 2005 - 2024

American Brother Designs
4.5 (2)

Regular price $101.49 $69.00 32% off

Unit price
per 

Cometic Timing Cover Gasket Set: Chrysler / Dodge / Jeep / Ram 5.7L Hemi / 6.1L SRT8 / 6.4L 392 / 6.2L Hellcat & Trackhawk 2003 - 2025
Cometic Timing Cover Gasket Set: Chrysler / Dodge / Jeep / Ram 5.7L Hemi / 6.1L SRT8 / 6.4L 392 / 6.2L Hellcat & Trackhawk 2003 - 2025
usa
DiabloSport Trinity 2 (T2 EX) Platinum Programmer / Monitor: Chrysler / Dodge / Ram 2005 - 2014
DiabloSport Trinity 2 (T2 EX) Platinum Programmer / Monitor: Chrysler / Dodge / Ram 2005 - 2014

DiabloSport Trinity 2 (T2 EX) Platinum Programmer / Monitor: Chrysler / Dodge 2005 - 2014

Diablo Sport
5.0 (3)

Regular price $818.95 $727.95 11% off

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per 

Vibrant O2 Sensor Restrictor Fitting (STRAIGHT) w/ Adjustable Jets (CEL Eliminator)
Vibrant O2 Sensor Restrictor Fitting (STRAIGHT) w/ Adjustable Jets (CEL Eliminator)

Vibrant O2 Sensor Restrictor Fitting (STRAIGHT) w/ Adjustable Jets (CEL Eliminator)

Vibrant
5.0 (1)

Regular price from $22.99 25% off

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per 

DiabloSport inTune i3 Platinum Programmer: Jeep Grand Cherokee / Wrangler / Commander 2005 - 2014

DiabloSport inTune i3 Platinum Programmer: Jeep Grand Cherokee / Wrangler / Commander 2005 - 2014

Diablo Sport
4.5 (2)

Regular price $535.95 $475.95 11% off

Unit price
per 

American Brother Designs Washer Fluid Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
American Brother Designs Washer Fluid Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
usa

American Brother Designs Washer Fluid Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025

American Brother Designs

Regular price $109.00 $59.00 46% off

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per 

DiabloSport inTune i3 Programmer: 300 / Challenger / Charger / Magnum / Ram / Durango 2005 - 2014
DiabloSport inTune i3 Programmer: 300 / Challenger / Charger / Magnum / Ram / Durango 2005 - 2014

DiabloSport inTune i3 Programmer: 300 / Challenger / Charger / Magnum / Ram / Durango 2005 - 2014

Diablo Sport
5.0 (2)

Regular price $535.95 $475.95 11% off

Unit price
per 

Cometic MLS Exhaust Manifold / Header Gaskets (Pair): Chrysler / Dodge / Jeep 5.7L Hemi 2003 - 2008
Cometic MLS Exhaust Manifold / Header Gaskets (Pair): Chrysler / Dodge / Jeep 5.7L Hemi 2003 - 2008
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Cometic MLS Exhaust Manifold / Header Gaskets (Pair): Chrysler / Dodge / Jeep 5.7L Hemi 2003 - 2008

Cometic Gasket

Regular price $44.19 $39.77 10% off

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per 

American Brother Designs Radiator Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
American Brother Designs Radiator Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
usa

American Brother Designs Radiator Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025

American Brother Designs
5.0 (1)

Regular price $109.00 $59.00 46% off

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per 

American Brother Designs Engine Bay Tag: Chrysler / Dodge / Jeep / Ram
American Brother Designs Engine Bay Tag: Chrysler / Dodge / Jeep / Ram
usa

American Brother Designs Engine Bay Tag: Chrysler / Dodge / Jeep / Ram

American Brother Designs
5.0 (1)

Regular price $76.00 $56.00 26% off

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per 

American Brother Designs Coolant Reservoir Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
American Brother Designs Coolant Reservoir Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
usa

American Brother Designs Coolant Reservoir Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025

American Brother Designs

Regular price $109.00 $59.00 46% off

Unit price
per 

Fast Hemis One-Click Stage 1 Kit: 2006-2010 Dodge Charger 3.5L V6 (+39HP)
Fast Hemis One-Click Stage 1 Kit: 2006-2010 Dodge Charger 3.5L V6 (+39HP)

Ripp Hi-Perf Coil Packs: Fits Dodge / Chrysler / Jeep V8 (02-26)

Ripp

from $489.46

Unit price
per 

6 colors
  • HEMI Orange
  • Plum Crazy
  • Sublime Green
  • Steel Gray
  • Mopar Blue
  • +1 more
DiabloSport Trinity 2 (T2 EX) Programmer / Monitor: Chrysler / Dodge  / Ram 2005 - 2014
DiabloSport Trinity 2 (T2 EX) Programmer / Monitor: Chrysler / Dodge  / Ram 2005 - 2014

DiabloSport Trinity 2 (T2 EX) Programmer / Monitor: Chrysler / Dodge 2005 - 2014

Diablo Sport

Regular price $818.95 $727.95 11% off

Unit price
per 

Pedal Commander Bluetooth Throttle Response Controller: 300 / Challenger / Charger / Magnum 2007 - 2024 (All Models)
Pedal Commander Bluetooth Throttle Response Controller: 300 / Challenger / Charger / Magnum 2007 - 2024 (All Models)
Flowmaster FloxFX Exhaust System: Jeep Grand Cherokee 4.0L / 4.7L 1999 - 2004
Flowmaster FloxFX Exhaust System: Jeep Grand Cherokee 4.0L / 4.7L 1999 - 2004
usa

Flowmaster FloxFX Exhaust System: Jeep Grand Cherokee 4.0L / 4.7L 1999 - 2004

Flowmaster
5.0 (2)

Regular price $393.95 $314.95 20% off

Unit price
per 

aFe 90mm Throttle Body Kit: Dodge Challenger / Charger / Chrysler 300 5.7L / 6.1L / 6.4L (05-14)
aFe 90mm Throttle Body Kit: Dodge Challenger / Charger / Chrysler 300 5.7L / 6.1L / 6.4L (05-14)
usa

aFe 90mm Throttle Body Kit: Dodge Challenger / Charger / Chrysler 300 5.7L / 6.1L / 6.4L (05-14)

aFe

$497.00

Unit price
per 

5.7L Hemi, 6.1L Hemi, 3.5L V6, 2.7L, 3.6L V6, 6.4L Hemi
MBRP Installer Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010
MBRP Installer Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010
Cometic MLS Head Gaskets (4.100" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025
Cometic MLS Head Gaskets (4.100" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025
usa

Cometic MLS Head Gaskets (4.100" Bore): Chrysler / Dodge / Ram / Jeep 5.7L Hemi 2003 - 2025

Cometic Gasket

Regular price from $96.54 Up to 36% off

Unit price
per 

JBA Shorty Headers (Raw Finish): Dodge Dakota & Ram 4.7L V8 2004 - 2007
JBA Shorty Headers (Raw Finish): Dodge Dakota & Ram 4.7L V8 2004 - 2007

JBA Shorty Headers (Raw Finish): Dodge Dakota & Ram 4.7L V8 2004 - 2007

JBA

Regular price $780.33 $709.39 9% off

Unit price
per 

MBRP XP Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010
MBRP XP Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010

MBRP XP Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010

MBRP

Regular price $599.11 $484.99 19% off

Unit price
per 

K&N 57 Series FIPK Cold Air Intake: Dodge Ram 4.7L V8 2002 - 2007 (1500)
K&N 57 Series FIPK Cold Air Intake: Dodge Ram 4.7L V8 2002 - 2007 (1500)
DiabloSport inTune i3 Programmer: Jeep Grand Cherokee / Wrangler / Commander 2005 - 2014
DiabloSport inTune i3 Programmer: Jeep Grand Cherokee / Wrangler / Commander 2005 - 2014

DiabloSport inTune i3 Programmer: Jeep Grand Cherokee / Wrangler / Commander 2005 - 2014

Diablo Sport

Regular price $535.95 $475.95 11% off

Unit price
per 

DiabloSport Predator 2 Tuner: Dodge Ram / Ram / Durango / Dakota 2005 - 2018 (V6 & V8 Models)
DiabloSport Predator 2 Tuner: Dodge Ram / Ram / Durango / Dakota 2005 - 2018 (V6 & V8 Models)

DiabloSport Predator 2 Tuner: Dodge Ram / Durango / Dakota 2005 - 2018 (V6 & V8 Models)

Diablo Sport
5.0 (2)

Regular price $532.95 $369.00 31% off

Unit price
per 

Cometic MLS Head Gasket (4.060" Bore, .051" Thickness): Dodge Viper 8.0L V10 1992 - 2002
Cometic MLS Head Gasket (4.060" Bore, .051" Thickness): Dodge Viper 8.0L V10 1992 - 2002
usa

Cometic MLS Head Gasket (4.060" Bore, .051" Thickness): Dodge Viper 8.0L V10 1992 - 2002

Cometic Gasket

Regular price $149.23 $134.31 10% off

Unit price
per 

AirAid Throttle Body Spacer: Dodge Ram 5.2L V8 & 5.9L V8 1994-2002
AirAid Throttle Body Spacer: Dodge Ram 5.2L V8 & 5.9L V8 1994-2002
K&N Air Filter: Dodge Durango (98-03) / Durango (04-09) / Durango (11-26)
K&N Air Filter: Dodge Durango (98-03) / Durango (04-09) / Durango (11-26)

Performance Upgrades for Your 3.7L V6 and 4.7L V8 Mopar Engines

The 3.7L V6 and 4.7L V8 engines serve as reliable, versatile Mopar powerplants found in various Dodge and Jeep models. These engines respond well to targeted performance upgrades that improve power delivery, throttle response, and durability while maintaining everyday drivability. Optimizing these engines with the right parts can enhance towing capability and add spirited driving performance.

Key Benefits of Upgrading Your 3.7L and 4.7L Engines

Both the 3.7L and 4.7L engines offer solid factory foundations, but bolt-on upgrades can unlock additional efficiency and power. Enhancements to intake and exhaust systems improve airflow, while ignition and tuning components refine combustion and throttle response. These improvements help your engine run stronger and more efficiently under various driving conditions.

  • Improved torque for towing and hauling
  • Enhanced throttle response and horsepower gains
  • Better engine efficiency and reliability
  • Maintains daily drivability with quality parts

Choosing the Right Performance Parts for Your Mopar V6 or V8

When selecting upgrades for the 3.7L or 4.7L, focus on components that complement the engine’s design and intended use. Cold air intakes and throttle body enhancements increase airflow, while exhaust headers and cat-back systems reduce backpressure. Upgrading ignition components and spark plugs ensures a stronger, more consistent spark. Finally, performance tuners and calibration tools optimize fuel and ignition timing for maximum efficiency.

Explore 3.7L and 4.7L Engine Upgrades at FastHemis

Whether you’re aiming to boost torque for towing or increase horsepower for spirited driving, FastHemis offers a curated selection of performance parts tailored to your 3.7L or 4.7L Mopar engine. Shop our collection to find intake kits, exhaust systems, ignition upgrades, and tuning solutions designed to unlock your engine’s full potential.

SELECT YOUR VEHICLE