3.7L / 4.0L Engine Upgrades
American Brother Designs Oil Cap Cover: Chrysler / Dodge / Jeep / Ram Hemi 2005 - 2024
American Brother Designs
Regular price
$101.49
$69.00
32% off
- Unit price
- /per
Vibrant O2 Sensor Restrictor Fitting (STRAIGHT) w/ Adjustable Jets (CEL Eliminator)
Vibrant
Regular price from $22.99 25% off
- Unit price
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American Brother Designs Washer Fluid Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
American Brother Designs
Regular price
$109.00
$59.00
46% off
- Unit price
- /per
American Brother Designs Radiator Cap Cover: Chrysler, Dodge, Jeep & Ram 2005 - 2025
American Brother Designs
Regular price
$109.00
$59.00
46% off
- Unit price
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American Brother Designs Engine Bay Tag: Chrysler / Dodge / Jeep / Ram
American Brother Designs
Regular price
$76.00
$56.00
26% off
- Unit price
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Ripp Magnetic Engine Oil Drain Plug: Fits Most Chrysler / Dodge / Jeep / Ram V6 & V8 Models (2003-2024)
Ripp
$24.95
- Unit price
- /per
DiabloSport Modified PCM + i3 Programmer Combo: 2009+ Charger/Challenger/300 5.7L Hemi
Diablo Sport
from Free
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
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Ripp Hi-Perf Coil Packs: Fits Dodge / Chrysler / Jeep V8 (02-26)
Ripp
from $489.46
- Unit price
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6 colors





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DeatschWerks 42lb Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2025 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$439.00
- Unit price
- /per
Pedal Commander Bluetooth Throttle Response Controller: 300 / Challenger / Charger / Magnum 2007 - 2023 (All Models)
Pedal Commander
Regular price
$349.99
$299.99
14% off
- Unit price
- /per
Deatschwerks 60lb/hr Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2024 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$699.00
- Unit price
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MBRP Installer Series Cat-Back Exhaust System: Jeep Grand Cherokee 4.7L & 5.7L Hemi 2005 - 2010
MBRP
Regular price
$450.87
$364.99
19% off
- Unit price
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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
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DeatschWerks Matched 550cc USCAR EV14 Fuel Injectors: Fits Hemi 5.7/6.1/6.4L
Deatschwerks
$649.00
- Unit price
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BBK Performance Header Gaskets: Chrysler 300C / Dodge Challenger / Charger / Magnum 2005 - 2008 (5.7L Hemi, 6.1L / 6.4L SRT8)
BBK
Regular price
$59.99
$49.99
17% off
- Unit price
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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
Edge Digital Monitor Insight CTS3: Fits Most Domestic Gas and Diesel Trucks 1996-2024 w/ Windshield Mounting Bracket
Edge
Regular price
$575.95
$511.95
11% off
- Unit price
- /per
K&N Air Filter: Dodge Ram 2002 - 2010 (All Models) / Ram 2011 - 2018 (All Models)
K&N Engineering
$55.19
- Unit price
- /per
King Chrysler Dodge Hemi 5.7L/6.1L V8 Performance Rod Bearing Set - Size STDX
King Engine Bearings
$207.65
- Unit price
- /per
JBA Shorty Headers (Raw Finish): Dodge Ram 5.7L Hemi 2003 - 2008 (1500, 2500 & 3500)
JBA
Regular price
$968.75
$880.68
9% off
- Unit price
- /per
Deatschwerks 72lb/hr Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2024 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$719.00
- Unit price
- /per
Deatschwerks 95lb/hr Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2024 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$719.00
- Unit price
- /per
Magnaflow Cat-Back Exhaust System: Jeep Grand Cherokee 5.7L Hemi 2005 - 2010
Magnaflow
$1,049.00
- Unit price
- /per
K&N Air Filter: Dodge Durango (98-03) / Durango (04-09) / Durango (11-26)
K&N Engineering
$67.19
- Unit price
- /per
DiabloSport Trinity 2 (T2 EX) Programmer / Monitor: Jeep Vehicles 2005 - 2014
Diablo Sport
Regular price
$806.95
$716.95
11% off
- Unit price
- /per
MagnaFlow BRE Exhaust Kit: Jeep Commander / Grand Cherokee 2005-2010
Magnaflow
$318.00
- Unit price
- /per
Superchips F5 Flashpaq Tuner: Fits Dodge / Ram / Chrysler (98-14)
Superchips
Regular price
$518.95
$460.95
11% off
- Unit price
- /per
American Brother Designs Custom Dip Stick Handle Cover: Chrysler, Dodge & Ram 2005 - 2025
American Brother Designs
$94.00
- Unit price
- /per
K&N Engineering 57 Series Cold Air Intake: Jeep Commander 3.7L / Grand Cherokee 3.7L (05-10)
K&N Engineering
$317.99
- Unit price
- /per
MBRP Cat-Back 3" Single Side Exhaust System: Dodge Dakota 2005 - 2007 (3.7L / 4.7L)
MBRP
Regular price
$568.22
$459.99
19% off
- Unit price
- /per
Liqui Moly Multipurpose Grease: Fits Most Dodge / Jeep / Triumph Models
LIQUI MOLY
$119.40
- Unit price
- /per
Yukon Gear & Axle Rear Wheel Bearing and Seal Kit: Fits Most Dodge / Ram Models (2004-2024)
Yukon Gear & Axle
$99.89
- Unit price
- /per
Go Rhino Mounting Brackets for RC2 Bull Bars: Fits Most Dodge Ram Models (2006-2009)
Go Rhino
Regular price
$81.89
$62.99
23% off
- Unit price
- /per
Deatschwerks 1250cc Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2025 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$1,049.00
- Unit price
- /per
Deatschwerks 1200cc Fuel Injectors: Chrysler / Dodge / Jeep / Ram 2003 - 2024 (5.7L Hemi, 6.1L SRT8, 6.4L 392)
Deatschwerks
$1,049.00
- Unit price
- /per
Flowmaster Super 40 Series Chambered Muffler: Fits Chrysler / Dodge (04-14)
Flowmaster
Regular price
$168.95
$134.95
20% off
- Unit price
- /per
Flowmaster Super 40 Series Chambered Muffler: Fits Chrysler / Dodge (04-13)
Flowmaster
Regular price
$192.95
$153.85
20% off
- Unit price
- /per
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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.