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Engine & Performance Parts

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  • FREE SHIPPING OVER $249
    Scan Gauge Truck Performance Monitor

    Scan Gauge Truck Performance Monitor

    SCAN GAUGE

    $206.99
    ScanGauge D Diagnostic and Performance MonitorThe ScanGaugeD is an incredible tool for monitoring your large diesel-powered vehicle. With 15+ built-in digital gauges, 5 trip computers, and an...
    29-1502135
    SKU:
    29-1502135
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Freightliner
    Make:
    Peterbilt
    Make:
    Western Star
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $206.99
    Qty in Cart: 0
    Price:
    $206.99
    Subtotal:
  • FREE SHIPPING
    Inlet Nox Nitrogen Oxide Sensor Replaces 2871978, 2894939 For Cummins ISX 2013 & Newer

    Inlet Nox Nitrogen Oxide Sensor Replaces 2871978, 2894939 For Cummins ISX 2013 & Newer

    DAYTON / DORMAN

    $402.99
    Nitrogen Oxide Sensor Inlet Of Diesel Particulate Filter Replaces 2871978, 2894939, 2894939RX, 4984053, 4984576The NOx sensor for Cummins ISX 2013 and newer models features a 590mm lead and operates...
    29-080600003
    SKU:
    29-080600003
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Style Options:
    Cummins
    Location:
    Made In USA
    Make:
    International
    Make:
    Bus
    Make:
    Freightliner
    Make:
    Volvo
    Product Type:
    Exhaust
    $402.99
    Qty in Cart: 0
    Price:
    $402.99
    Subtotal:
  • Steel Oil Pan - Replaces 3680531 & 3687414 By BESTfit For Cummins ISX Engine

    Steel Oil Pan - Replaces 3680531 & 3687414 By BESTfit For Cummins ISX Engine

    BESTFIT TRUCK PARTS

    $379.99
    BESTfit 10-12 Gallon Oil Pan Fits Cummins ISX EnginesThis high quality 10-12 gallon Steel Oil Pan for the Cummins ISX Engine is made of a durable steel construction that ensures a long lasting...
    29-074952540
    SKU:
    29-074952540
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Product Type:
    Engine Parts
    Make:
    Freightliner
    Make:
    International
    Make:
    Western Star
    Make:
    Kenworth
    Style Options:
    Cummins
    Ready To Ship:
    Yes
    $379.99
    Qty in Cart: 0
    Price:
    $379.99
    Subtotal:
  • BESTfit Front Engine Cover For Cummins N-14 Models For Cummins N14 Series Engine

    BESTfit Front Engine Cover For Cummins N-14 Models For Cummins N14 Series Engine

    BESTFIT TRUCK PARTS

    $522.99
    BESTfit N-14 Cummins Front Engine Cover For Tilt Engine ApplicationThis high quality front engine cover that fits Cummins N-14 models has the accessory drive bushing installed and for a tilt engine...
    29-073411458
    SKU:
    29-073411458
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Product Type:
    Engine Parts
    Make:
    International
    Make:
    Kenworth
    Make:
    Freightliner
    Make:
    Western Star
    Make:
    Volvo
    Style Options:
    Cummins
    $522.99
    Qty in Cart: 0
    Price:
    $522.99
    Subtotal:
  • BESTfit Cummins Flywheel Housing For Ford LTL

    BESTfit Cummins Flywheel Housing For Ford LTL

    BESTFIT TRUCK PARTS

    $759.99
    BESTfit Flywheel Housing Fits Ford* Made Of High Quality Aluminum* With Cummins Engine* Degree Tilt Mount Applications* Starter Location: Driver Side At 9 O'clock 3/4 Inch Motor Mount Holes* Sold...
    29-073002067
    SKU:
    29-073002067
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Ford
    Product Type:
    Engine Parts
    Position:
    Driver Side
    Style Options:
    Cummins
    Ready To Ship:
    Yes
    $759.99
    Qty in Cart: 0
    Price:
    $759.99
    Subtotal:
  • BESTfit Detroit 60 Series Flywheel Housing With 14MM Mounting Holes

    BESTfit Detroit 60 Series Flywheel Housing With 14MM Mounting Holes

    BESTFIT TRUCK PARTS

    $963.99
    BESTfit Aluminum Flywheel Housing, Replaces 23522643When precision matters, trust the BESTfit Detroit 60 Series Flywheel Housing to maintain your engine's performance. Made from durable aluminum,...
    29-0723522643
    SKU:
    29-0723522643
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Kenworth
    Make:
    International
    Make:
    Peterbilt
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $963.99
    Qty in Cart: 0
    Price:
    $963.99
    Subtotal:
  • Flywheel Housing With 12MM Mounting Holes By BESTfit For Detroit 60 Series

    Flywheel Housing With 12MM Mounting Holes By BESTfit For Detroit 60 Series

    BESTFIT TRUCK PARTS

    $851.99
    BESTfit Aluminum Flywheel Housing, Replaces 23505073This aftermarket aluminum flywheel housing for the Detroit 60 Series incorporates SAE #1 12mm mounting holes. The starter is on the left driver's...
    29-0723505073
    SKU:
    29-0723505073
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    International
    Make:
    Freightliner
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $851.99
    Qty in Cart: 0
    Price:
    $851.99
    Subtotal:
  • BESTfit D13 Flywheel Replaces 21514067 For Mack MP8 & Volvo

    BESTfit D13 Flywheel Replaces 21514067 For Mack MP8 & Volvo

    BESTFIT TRUCK PARTS

    $442.99
    BESTfit Flywheel For Mack MP8 & Volvo D13 Engines* High Quality Flywheel* For Mack MP8 And Volvo D13* Sold Individually* Warranty On Flywheels Against Defects In Workmanship & Material From Date Of...
    29-0721514067
    SKU:
    29-0721514067
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Mack
    Make:
    Volvo
    Product Type:
    Engine Parts
    $442.99
    Qty in Cart: 0
    Price:
    $442.99
    Subtotal:
  • BESTfit D13 Flywheel With I-Shift Replaces 21184666 For Volvo

    BESTfit D13 Flywheel With I-Shift Replaces 21184666 For Volvo

    BESTFIT TRUCK PARTS

    $609.99
    BESTfit Flywheel Fits Volvo D13 EngineTrust the BESTfit D13 Flywheel with I-Shift to maintain the high performance of your Volvo D13 engine. Designed for long-lasting durability and precision fit,...
    29-0721184666
    SKU:
    29-0721184666
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Volvo
    Product Type:
    Engine Parts
    $609.99
    Qty in Cart: 0
    Price:
    $609.99
    Subtotal:
  • BESTfit VED12 Flywheel With 15 Inch Clutch Replaces 20730056 For Volvo

    BESTfit VED12 Flywheel With 15 Inch Clutch Replaces 20730056 For Volvo

    BESTFIT TRUCK PARTS

    $441.99
    BESTfit Flywheel With 14 Bolt Holes For MountingDepend on the BESTfit VED12 Flywheel to maintain optimal clutch and engine performance on Volvo VED12 applications. Designed for 15-inch clutches, it...
    29-0720730056
    SKU:
    29-0720730056
    Truck Class:
    Heavy Duty
    Make:
    Volvo
    Product Type:
    Engine Parts
    Style Options:
    Flat
    Diameter Options:
    19 Inch
    $441.99
    Qty in Cart: 0
    Price:
    $441.99
    Subtotal:
  • BESTfit Oil Cooler Replaces 20745961 For Mack MP8 & Volvo D16 Engines

    BESTfit Oil Cooler Replaces 20745961 For Mack MP8 & Volvo D16 Engines

    BESTFIT TRUCK PARTS

    $292.99
    BESTfit Oil Cooler Fits Mack MP8 & D16* High Quality Oil Cooler* For Mack MP8 And Volvo D16* Sold Individually* Warranty On Oil Coolers Against Defects In Workmanship & Material From Date Of...
    29-072036
    SKU:
    29-072036
    Truck Class:
    Heavy Duty
    Make:
    Mack
    Make:
    Volvo
    Product Type:
    Engine Parts
    $292.99
    Qty in Cart: 0
    Price:
    $292.99
    Subtotal:
  • BESTfit Oil Cooler For Detroit DD15 Engines - Replaces 4721800965

    BESTfit Oil Cooler For Detroit DD15 Engines - Replaces 4721800965

    BESTFIT TRUCK PARTS

    $344.99
    BESTfit Oil Cooler For Detroit DD15 Engines* High Quality Oil Cooler* For Detroit DD15 Applications* Sold Individually* Warranty On Oil Coolers Against Defects In Workmanship & Material From Date Of...
    29-072035
    SKU:
    29-072035
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    $344.99
    Qty in Cart: 0
    Price:
    $344.99
    Subtotal:
  • BESTfit Oil Cooler For Detroit DD15 Engine - Replaces 4711800865

    BESTfit Oil Cooler For Detroit DD15 Engine - Replaces 4711800865

    BESTFIT TRUCK PARTS

    $283.99
    BESTfit Oil Cooler For Detroit DD15 Engine* High Quality Oil Cooler* For Detroit DD15 Applications* Sold Individually* Warranty On Oil Coolers Against Defects In Workmanship & Material From Date Of...
    29-072034
    SKU:
    29-072034
    Truck Class:
    Heavy Duty
    Product Type:
    Engine Parts
    $283.99
    Qty in Cart: 0
    Price:
    $283.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit EZ Oil Drain Valve 27mm-2.0

    BESTfit EZ Oil Drain Valve 27mm-2.0

    BESTFIT TRUCK PARTS

    $60.99
    BESTfit EZ Oil Drain Valve For Cummins ISX, QSX15, NaviStar MaxxForce 13 & 15, Mack M-P10 & Volvo D-16 EnginesChanging your oil is made easier with the EZ Oil Drain Valve. Unlike spring-assisted gate...
    29-072006
    SKU:
    29-072006
    Truck Class:
    Heavy Duty
    Material Options:
    Steel
    Make:
    Volvo
    Make:
    Mack
    Make:
    International
    Product Type:
    Engine Parts
    Ready To Ship:
    Yes
    $60.99
    Qty in Cart: 0
    Price:
    $60.99
    Subtotal:
  • FREE SHIPPING
    BESTfit Aluminum Rear Sump Engine Oil Pan W/ Drain Plugs & Side Ports For Freightliner & Western Star

    BESTfit Aluminum Rear Sump Engine Oil Pan W/ Drain Plugs & Side Ports For Freightliner & Western Star

    BESTFIT TRUCK PARTS

    $1,355.99
    BESTfit Sump Engine Oil Pan W/ 10 Mounting BoltsThis Detroit S60 aluminum oil pan with drain plugs and side ports can replace an OEM fiberglass oil pan. It comes with gaskets and holes pre cut for...
    29-0720005
    SKU:
    29-0720005
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $1,355.99
    Qty in Cart: 0
    Price:
    $1,355.99
    Subtotal:
  • Detroit Series 60 Thermoplastic Oil Pan Without Side Ports For 60 Front Sump

    Detroit Series 60 Thermoplastic Oil Pan Without Side Ports For 60 Front Sump

    AUTOMANN USA

    $600.99
    Replacement Oil Pan For Detroit 60 Front Sump Without Side Ports* High Quality Oil Pan* Made Of Thermoplastic* For Detroit 60 Front Sump 40 Quart* With 10 Bolt Holes* Sold Individually* Warranty On...
    29-0720003
    SKU:
    29-0720003
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Make:
    Peterbilt
    Product Type:
    Engine Parts
    $600.99
    Qty in Cart: 0
    Price:
    $600.99
    Subtotal:
  • Thermoplastic Oil Pan W/ Side Ports For 60 Front Sump For Detroit Series 60

    Thermoplastic Oil Pan W/ Side Ports For 60 Front Sump For Detroit Series 60

    AUTOMANN USA

    $428.99
    Replacement Oil Pan For Detroit 60 Front Sump With Side PortsEnsure your Detroit 60 Front Sump engine operates at peak performance with the Detroit Series 60 Thermoplastic Oil Pan with Side Ports...
    29-0720002
    SKU:
    29-0720002
    Truck Class:
    Heavy Duty
    Make:
    Peterbilt
    Make:
    Kenworth
    Product Type:
    Engine Parts
    $428.99
    Qty in Cart: 0
    Price:
    $428.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300039 High Performance Air Filter

    3 Layer Replacement Air Filter Wrap For 29-071300039 High Performance Air Filter

    FLEET FILTERS

    $112.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300039* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300040
    SKU:
    29-071300040
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $112.99
    Qty in Cart: 0
    Price:
    $112.99
    Subtotal:
  • High Flow Performance Air Filter With Washable Element Media For Freightliner Cascadia, Coronado, M2

    High Flow Performance Air Filter With Washable Element Media For Freightliner Cascadia, Coronado, M2

    FLEET FILTERS

    $585.99
    High Performance Air Filter Media, Replaces FA6102You never need to waste money on paper filters again! 4 State Trucks proudly offers Fleet Air Filters, the only lifetime, washable, high flow, air...
    29-071300039
    SKU:
    29-071300039
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $585.99
    Qty in Cart: 0
    Price:
    $585.99
    Subtotal:
  • 3 Layer Replacement Air Filter Wrap For 29-071300036 High Performance Air Filter For Freightliner Cascadia 116/126

    3 Layer Replacement Air Filter Wrap For 29-071300036 High Performance Air Filter For Freightliner Cascadia 116/126

    FLEET FILTERS

    $195.99
    3 Layer Replacement Air Filter Wrap For High Performance Air Filter* High Quality Replacement Air Filter Wrap* For 29-071300036* 3 Layer Design* Does Not Come Pre-Oiled* Oil Is Required Before...
    29-071300038
    SKU:
    29-071300038
    Truck Class:
    Heavy Duty
    Make:
    Freightliner
    Product Type:
    Engine Parts
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
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Adding your products to cart

Frequently Asked Questions About Engine & Performance Parts

How do I know if an engine or performance part will fit my truck?

Fitment depends on your truck's make, model, engine family, and year, so it's important to check the compatibility details listed on each product page before ordering. If you're unsure, have your VIN or engine serial number on hand and reach out to our team so we can confirm the part matches your specific setup.

Will installing a performance part affect my truck's warranty or emissions compliance?

Some engine and performance components, especially those related to fuel delivery, exhaust, or emissions systems, can impact manufacturer warranties or federal and state emissions compliance depending on your truck's model year and how it's used. We recommend reviewing manufacturer warranty terms and local regulations before installing any part that alters factory engine settings or emissions output.

Can I install these parts myself, or do I need a professional?

Many parts, such as filters, gaskets, sensors, and belts, are straightforward enough for an experienced DIYer with the right tools. More involved components, like turbochargers, ECM modules, or major engine internals, typically require professional installation to ensure proper calibration and to avoid damage. If a listing includes detailed install instructions or torque specs, that's a good sign the job can be handled in-house; otherwise, we suggest having a qualified diesel technician install it.

What's the difference between OEM and aftermarket performance parts?

OEM parts are made to match your truck's original factory specifications, offering predictable fit and performance. Aftermarket performance parts are often designed to improve on stock capability, whether that's horsepower, fuel efficiency, or durability, but quality and results can vary by brand. We list manufacturer information on each product page so you can compare options and choose what fits your priorities and budget.

How long do engine and performance parts typically last before needing replacement?

Lifespan varies widely depending on the specific part, how the truck is used, and maintenance habits. Wear items like filters and belts need more frequent replacement, while components like turbochargers or sensors can last much longer with proper care. Check the product description for any manufacturer-suggested service intervals, and keep an eye on your truck's performance for early signs that a part may need attention.


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