High-flow diesel exhaust systems for trucks and SUVs. 4" and 5" systems, DPF-back kits, and performance upgrades for maximum power and efficiency.

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Best AP Exhaust catalytic-converter for 2006-2001 Ford Ranger | Direct Fit | EPA/CARB Compliant | 645871

$1,284.28

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2003-2001 Dodge Dakota | Direct Fit | EPA/CARB Compliant | 645870

$1,271.26

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2003-2001 Dodge Dakota | Direct Fit | EPA/CARB Compliant | 645869

$1,175.46

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2004 Jeep Liberty Left | Direct Fit | EPA/CARB Compliant | 645867

$1,159.66

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2005-2004 Dodge Ram 1500 Right | Direct Fit | EPA/CARB Compliant | 645866

$705.80

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2007-2006 Chevrolet Trailblazer | Direct Fit | EPA/CARB Compliant | 645864

$769.86

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2005-2003 Chevrolet Express 3500 Right | Direct Fit | EPA/CARB Compliant | 645863

$933.96

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2005-2003 Chevrolet Express 3500 Left | Direct Fit | EPA/CARB Compliant | 645862

$1,057.04

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2003-2000 Dodge Dakota | Direct Fit | EPA/CARB Compliant | 645860

$2,238.48

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2003-2000 Dodge Dakota | Direct Fit | EPA/CARB Compliant | 645859

$1,154.02

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2001-2000 Dodge Ram 1500 | Direct Fit | EPA/CARB Compliant | 645858

$847.38

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

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Best AP Exhaust catalytic-converter for 2005-2004 Dodge Ram 1500 Right | Direct Fit | EPA/CARB Compliant | 645854

$921.30

ARISTO's proprietary substrate chemistry yields highly efficient loadings for lower cost and better converter efficiency...

Frequently Asked Questions

What size exhaust for deleted diesel?

4" is minimum for deleted diesels; 5" is ideal for heavily modified trucks. Larger diameter dramatically reduces EGT and backpressure, crucial when deleting emissions equipment. Straight-pipe or single muffler designs flow best. Note: Emissions deletion is illegal for street use.

Will bigger exhaust help my stock diesel?

Yes! Even stock diesels benefit from 4" turbo-back systems. Expect lower EGT (50-100°F drop), slightly better MPG (1-2), and improved throttle response. Gains increase dramatically with tuning. Larger exhaust is essential foundation for any diesel performance build.

Turbo-back vs DPF-back exhaust for diesel?

Turbo-back systems (from turbo to tip) provide maximum performance by reducing all backpressure. DPF-back systems (behind diesel particulate filter) maintain emissions compliance while improving flow. For stock trucks staying emissions-legal, DPF-back offers best balance of performance and legality.

How much HP does exhaust add to diesel?

On stock diesel engines, exhaust alone adds 10-20 HP. With tuning, the same exhaust supports 50-100+ HP gains by reducing EGT and backpressure. Exhaust is essential before adding power - it's not the biggest power adder itself but enables other modifications to work safely.