Collection: AFTERMARKET ENGINE & TRANSMISSION ACCESSORIES

Premium Aftermarket Accessories for GM Engine and Transmission

Upgrade your vehicle’s performance with high‑quality aftermarket engine and transmission accessories designed for durability, precision, and power. From performance intakes and cooling components to upgraded clutches, torque converters, sensors, and mounts, our products help drivers get more reliability and responsiveness out of every ride.

Whether you’re restoring a classic, building a track-ready setup, or just improving daily drivability, our selection delivers enhanced horsepower, smoother shifting, better heat management, and longer component life. We focus on trusted brands, proven engineering, and parts that fit right the first time—so you can maintain, customize, or optimize your vehicle with confidence.

 

Enhance Performance with GM Engine Components

 

 

Aftermarket accessories designed for your GM engine can significantly improve overall vehicle performance and reliability. Whether you seek better fuel efficiency or increased horsepower, compatible engine parts offer tailored solutions for maintenance and upgrades. Choosing high-quality GM engine accessories ensures seamless fitment and durability, helping your vehicle perform at its best for longer periods. These components are engineered to meet or exceed OEM specifications, offering peace of mind while optimizing your engine’s power and longevity on the road.

 

 

Durable and Efficient GM Transmission Parts

 

 

Maintaining or upgrading your GM transmission with aftermarket accessories provides improved shifting smoothness and enhanced transmission life. These parts are crafted for durability and precision, ensuring reliable power transfer from engine to wheels. Selecting the right GM transmission accessories helps prevent costly repairs by reducing wear and tear. OEM-quality alternatives offer a cost-effective way to keep your transmission running efficiently without sacrificing performance or compatibility with your vehicle’s systems.

 

 

Benefits of Upgrading Your Engine and Transmission

 

 

Upgrading both your engine and transmission with aftermarket accessories can greatly improve your vehicle’s responsiveness and fuel economy. Well-selected parts contribute to reduced mechanical stress and heat generation, extending the lifespan of critical components. Such enhancements not only boost driving enjoyment but also preserve the value of your vehicle. By investing in quality GM engine and transmission accessories, you ensure your vehicle performs reliably, maintains smooth operation, and meets the demands of everyday driving and performance needs alike.

 

 

 

Enhance Performance with GM Engine Components

 

 

Aftermarket accessories designed for your GM engine can significantly improve overall vehicle performance and reliability. Whether you seek better fuel efficiency or increased horsepower, compatible engine parts offer tailored solutions for maintenance and upgrades. Choosing high-quality GM engine accessories ensures seamless fitment and durability, helping your vehicle perform at its best for longer periods. These components are engineered to meet or exceed OEM specifications, offering peace of mind while optimizing your engine’s power and longevity on the road.

 

 

Durable and Efficient GM Transmission Parts

 

 

Maintaining or upgrading your GM transmission with aftermarket accessories provides improved shifting smoothness and enhanced transmission life. These parts are crafted for durability and precision, ensuring reliable power transfer from engine to wheels. Selecting the right GM transmission accessories helps prevent costly repairs by reducing wear and tear. OEM-quality alternatives offer a cost-effective way to keep your transmission running efficiently without sacrificing performance or compatibility with your vehicle’s systems.

 

 

Benefits of Upgrading Your Engine and Transmission

 

 

Upgrading both your engine and transmission with aftermarket accessories can greatly improve your vehicle’s responsiveness and fuel economy. Well-selected parts contribute to reduced mechanical stress and heat generation, extending the lifespan of critical components. Such enhancements not only boost driving enjoyment but also preserve the value of your vehicle. By investing in quality GM engine and transmission accessories, you ensure your vehicle performs reliably, maintains smooth operation, and meets the demands of everyday driving and performance needs alike.

 

 

993 products

993 products

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  • LS Hi-Ram EFI Manifold - Black GM LS1/LS2/LS6 - 105MM Throttle Body

    Regular price $1,249.95 USD
    Regular price $1,406.95 USD Sale price $1,249.95 USD
    Black LS Hi-Ram EFI tunnel ram intake manifold for GM LS1, LS2, and LS6 with 105mm throttle body from The Tuner Store
    Sold out
  • LS Hi-Flow Fuel Rails - Fits LS1, LS2, LS3, LS6 & L99 factory intakes

    Regular price $254.95 USD
    Regular price $286.95 USD Sale price $254.95 USD
    LS Hi-Flow Fuel Rails by The Tuner Store for LS1, LS2, LS3, LS6, and L99 factory intakes, showing the shiny metal finish.
    Sale
  • LS Hi-Ram EFI Manifold GM LS7 - 92MM Throttle Body

    Regular price $1,349.95 USD
    Regular price $1,518.95 USD Sale price $1,349.95 USD
    LS Hi-Ram EFI manifold with 92mm throttle body for GM LS7 engines, tunnel ram intake manifold by The Tuner Store
    Sale
  • LS1/6 (24x/1x) Engine Main Harness

    Regular price $675.95 USD
    Regular price $760.95 USD Sale price $675.95 USD
    Holley EFI LS1/6 engine main harness by The Tuner Store, 24x/1x service part with wiring connectors and engine wiring assembly.
    Sale
  • LS Hi-Ram EFI Manifold GM LS7 - 105MM Throttle Body

    Regular price $1,349.95 USD
    Regular price $1,518.95 USD Sale price $1,349.95 USD
    GM LS7 LS Hi-Ram EFI manifold with 105mm throttle body, tunnel ram intake manifold for high-performance engine upgrades.
    Sale
  • LS Hi-Ram EFI Manifold GM LS1/LS2/LS6 - 105MM Throttle Body

    Regular price $1,199.95 USD
    Regular price $1,349.95 USD Sale price $1,199.95 USD
    LS Hi-Ram EFI manifold for GM LS1/LS2/LS6 with 105mm throttle body, tunnel ram intake manifold for performance engines
    Sale
  • Main Engine Harness for 24x LS w/TBI

    Regular price $749.95 USD
    Regular price $843.95 USD Sale price $749.95 USD
    Holley EFI engine harness for 24x LS with TBI, designed for Holley EFI service parts by The Tuner Store.
    Sale
  • MPFI/TPI Main Harness Connector Kit

    Regular price $155.95 USD
    Regular price $175.95 USD Sale price $155.95 USD
    Holley EFI MPFI/TPI main harness connector kit with wiring connectors and terminals for automotive engine management.
    Sale
  • LS Coil Extension Harnesses

    Regular price $134.95 USD
    Regular price $151.95 USD Sale price $134.95 USD
    Holley EFI LS Coil Extension Harness by The Tuner Store, showing detailed wiring connectors for engine management.
    Sale
  • Replacement Fuel Rail Kit For Lo-Ram Dual Injector Manifolds

    Regular price $371.95 USD
    Regular price $418.95 USD Sale price $371.95 USD
    Black replacement fuel rail kit for Lo-Ram dual injector manifolds, compatible with intake manifold accessories.
    Sale
  • Main Engine Harness for 58X LS w/TBI

    Regular price $727.95 USD
    Regular price $818.95 USD Sale price $727.95 USD
    Main engine harness for 58X LS with TBI, Holley EFI service parts, by The Tuner Store, featuring electrical connectors and wiring.
    Sold out
  • LT1 Hi-Ram, Lower Manifold Only w/out Port EFI Provisions. Order Plenum Top Separately.

    Regular price $779.95 USD
    Regular price $877.95 USD Sale price $779.95 USD
    LT1 Hi-Ram lower manifold for tunnel ram intake, without port EFI provisions, shown with separate plenum top, by The Tuner Store.
    Sale
  • LS Hi-Ram EFI Manifold GM LS1/LS2/LS6 - 92MM Throttle Body

    Regular price $1,149.95 USD
    Regular price $1,293.95 USD Sale price $1,149.95 USD
    LS Hi-Ram EFI Tunnel Ram Intake Manifold for GM LS1/LS2/LS6 with 92mm throttle body, featuring polished aluminum finish.
    Sale
  • LSX Main Harness Connector Kit

    Regular price $167.95 USD
    Regular price $188.95 USD Sale price $167.95 USD
    Holley EFI LSX Main Harness Connector Kit from The Tuner Store, featuring electrical connectors and service parts for vehicle wiring.
    Sale
  • LS2/3/7+ (58x/4x) Engine Main Harness

    Regular price $675.95 USD
    Regular price $760.95 USD Sale price $675.95 USD
    Holley EFI LS2/3/7+ engine main harness for Holley EFI systems, shown in the Tuner Store service parts image.
    Sale
  • Idle Air Control (IAC) Motor for Holley Sniper 85/90/92/102mm & Holley EFI 90/95/105mm Throttle Bodies – GM OE# 17113598

    Regular price $119.46 USD
    Regular price $116.95 USD Sale price $119.46 USD
    Idle Air Control (IAC) motor for Holley Sniper and EFI throttle bodies, compatible with GM OE# 17113598, from The Tuner Store