Turbochargers

When you are ready for the next level, we have what you need!

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6.5L Parts Specialists

We have you covered!

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Quadstar GEP Optimizer 6500

Complete Engines

We stock complete Optimizer engines and parts thereof

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Reliability

When factory parts fail, we have a solution!

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ARP Fastners

Our unmatched supply of unique fastners is proudly made in the USA by ARP!

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Quadstar GEP Optimizer 6500

In House Tuning

International Shipping

Frequent New Products

Constantly Innovating

Featured Items

NEW or Featured Items

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6.5L DB2 Throttle Cable
Quadstar Tuning LLC

6.5L DB2 Throttle Cable

Out of stock
$129.99 USD
Sale
Hot Shot's Secret Everyday Diesel Treatment
Hotshot's Secret

Hot Shot's Secret Everyday Diesel Treatment

Only 3 left
From $19.99 USD
$20.43 USD From $19.99 USD
6.5L OBDII Single Tune for 1996+
Quadstar Tuning

6.5L OBDII Single Tune for 1996+

In stock
$350.00 USD
Remanufactured DS4 Injection Pump
Quadstar Tuning

Remanufactured DS4 Injection Pump

In stock
$1,095.00 USD
6.5L DB2833-6284 Injection Pump
STANADYNE

6.5L DB2833-6284 Injection Pump

In stock
$2,150.00 USD
6.5L Performance Piston Kit
Quadstar Tuning

6.5L Performance Piston Kit

Only 3 left
$1,500.00 USD
Sale
Quadstar GEP Optimizer 6500
AM General

AMG GEP Optimizer 6500 Long Block

In stock
From $8,500.00 USD
$8,950.00 USD From $8,500.00 USD
Sale
Fluidampr and Big Ass Balancer Bolt Kit
Quadstar Tuning

Fluidampr and Big Ass Balancer Bolt Kit

Out of stock
$560.00 USD
$633.54 USD $560.00 USD

Products by Collection

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Cooling

Cooling

Radiators, oil cooler lines, transmission coolers and all related components
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Custom Tuning

Custom Tuning

Custom tuning and tuners for your 6.5L turbo diesel. All work is performed in-house and tailored to your needs!
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Engine Electronics

Engine Electronics

Sensors, wiring, charging, and modules

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Fuel Injection

Fuel Injection

Pumps, Injectors, Lift Pumps, Filters, additives and everything else!
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Engines and Cylinder Heads

Engines and Cylinder Heads

Complete engines and cylinder heads

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Intake & Exhaust

Intake & Exhaust

Air intake and exhaust parts
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Turbochargers & Parts

Turbochargers & Parts

Turbocharger kits, parts, and installation components
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Engine Internals

Engine Internals

6.2 6.5L engine rebuild parts and upgrades
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Gaskets and Seals

Gaskets and Seals

Individual gaskets and kits

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Engine External

Engine External

External parts and accessories related to the 6.2 or 6.5L diesel engine
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Gauges & Monitoring

Gauges & Monitoring

Gauges, pods, monitors, and sensors
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All Products

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