2004.5-2005 6.6L LLY DURAMAX
Tameless Performance provides high-quality performance parts for 2004.5-2005 GMC and Chevy trucks with the 6.6L LLY Duramax engine. Our carefully selected components are crafted to enhance power, boost fuel efficiency, and ensure reliable, long-term performance. With parts ranging from advanced turbochargers and high-flow exhaust systems to fuel system upgrades and cold air intakes, you can improve your truck’s horsepower, torque, and overall efficiency. Perfect for towing, off-road excursions, or daily driving, our LLY Duramax parts help you make the most out of your truck’s potential.
POPULAR CATEGORIES

ENGINE & PERFORMANCE

DRIVETRAIN & SUSPENSION

EXTERIOR PARTS & ACCESSORIES

INTERIOR PARTS & ACCESSORIES

LIGHTING & ACCESSORIES

FLUIDS & FILTERS

TOOLS & GEAR
ENGINE & PERFORMANCE

AIR INTAKE SYSTEMS & FILTERS

PROGRAMMERS, TUNERS, & MONITORS

ENGINE PARTS & ACCESSORIES

TURBOS & ACCESSORIES

FUEL SYSTEMS & UPGRADES

INTERCOOLERS, PIPES, & BOOTS

EXHAUST SYSTEMS & COMPONENTS

COOLING SYSTEMS

AIR CONDITIONING & HEATING

HEAT CONTROL

FLUIDS & FILTERS
DRIVETRAIN & CHASSIS

AXLE & DRIVELINE

LEVELING KITS

LIFT KITS

SHOCK ABSORBERS

STEERING COMPONENTS

TRANSMISSIONS & ACCESSORIES

MANUAL TRANSMISSION CLUTCHES

BRAKES, ROTORS, & CALIPERS

AIR BAGS & LOAD SUPPORT

SUSPENSION & CHASSIS PARTS

TRACTION BARS
EXTERIOR PARTS & ACCESSORIES

BED COVERS

BED LINERS

STEPS & RUNNING BOARDS

FENDER FLARES, MUD GUARDS, & TRIM

BUMPERS

GRILLES

HITCHES & TOWING

WINCH & RECOVERY

OFFROAD TRUCK WHEELS
INTERIOR PARTS & ACCESSORIES
LIGHTING & ACCESSORIES

HEADLIGHTS

TAIL LIGHTS

THIRD BRAKE LIGHT

FOG LIGHTS

LED LIGHTS

LED LIGHT BARS

LIGHT MOUNTING OPTIONS

ACCENT LIGHTING
Power Up Your 2004.5–2005 6.6L LLY Duramax with Proven Performance Parts
Bring new life and power to your 2004.5–2005 6.6L LLY Duramax with premium performance parts and accessories from Tameless Performance. Whether you use your truck for towing, off-roading, or simply want more everyday driving power, our LLY-specific upgrades are built to deliver real results—on the road, on the job, or at the track. This generation of the Duramax is known for its reliability and strong potential for performance tuning. With the right combination of cold air intakes, intercoolers, turbo upgrades, fuel system enhancements, and exhaust systems, you can unlock serious gains in horsepower, torque, and efficiency—all while improving engine longevity.
Why Choose Tameless Performance for Your LLY Duramax?
- Built for 2004.5–2005 Duramax Trucks: Every part we offer is carefully selected for fitment, reliability, and power on the LLY platform.
- Top-Shelf Diesel Brands: We stock only the most trusted names in diesel performance, tested and proven by enthusiasts and pros alike.
- Performance That Works: Get better towing capacity, quicker throttle response, and more efficient fuel delivery.
- Support from Diesel Experts: Not sure what your build needs? Our team is here to help you make the right choice for your truck and goals.
Shop 2004.5–2005 LLY Duramax Performance Parts Today
Ready to enhance your ride? Browse our full lineup of 2004.5–2005 6.6L LLY Duramax performance parts and accessories today. Whether you're restoring your truck or building it into a powerhouse, Tameless Performance has the products and support to help you succeed. Shop 2004.5–2005 LLY Duramax Performance Parts & Accessories
Your LLY, Upgraded the Right Way
The LLY Duramax platform is capable of impressive performance gains with the right upgrades. At Tameless Performance, we provide the parts, knowledge, and support to help you turn potential into power—mile after mile.
Keywords: 2004.5–2005 6.6L LLY Duramax performance parts, LLY upgrades, turbo kits, intake systems, exhaust parts, fuel system enhancements, Duramax towing performance, diesel truck accessories.
The Trusted Source for Diesel Truck Performance
Tameless Performance is a trusted source for diesel truck performance parts and accessories. We offer competitive prices, a wide selection of products, and expert advice to help you choose the right parts for your truck. We are committed to providing our customers with the highest quality products and the best possible service. Shop with confidence at Tameless Performance and experience the difference that performance parts can make.
Contact Us
For more information or assistance in selecting the right performance parts for your 2004.5–2005 6.6L LLY Duramax, please contact us. Our team of experts is ready to help you achieve your performance goals.
Note: Always ensure compatibility with your vehicle before purchasing and consider professional installation for optimal results.

Free Shipping
Enjoy Free Shipping on Orders over $99

Satisfaction Guaranteed
Shop with Confidence with the Tameless Guarantee!

We Offer Financing
Play Now, Pay Later
with Easy Financing Options

Secure Payments
We use SSL encryption for a secure shopping experience.