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 2003-2001 Ford F-150 Right | Direct Fit | EPA/CARB Compliant | 645412

$1,705.50

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 1999-1997 Buick LeSabre | Direct Fit | EPA/CARB Compliant | 645410

$699.30

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 2004-2001 Ford Escape Rear | Direct Fit | EPA/CARB Compliant | 645409

$627.78

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 2002-2000 Chevrolet Camaro Left | Direct Fit | EPA/CARB Compliant | 645408

$837.76

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 2002-2000 Chevrolet Camaro Right | Direct Fit | EPA/CARB Compliant | 645407

$884.04

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 1998-1997 Jeep Wrangler | Direct Fit | EPA/CARB Compliant | 645405

$795.70

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 2000-1997 Ford F-150 Left | Direct Fit | EPA/CARB Compliant | 645403

$1,631.80

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 2000-1997 Ford F-150 Right | Direct Fit | EPA/CARB Compliant | 645402

$1,276.42

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 Toyota Sienna Rear | Direct Fit | EPA/CARB Compliant | 645401

$1,061.44

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 Toyota Sienna Center | Direct Fit | EPA/CARB Compliant | 645400

$1,307.04

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 2003-2001 Ford F-150 Left | Direct Fit | EPA/CARB Compliant | 645399

$1,761.44

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 2002-2000 Toyota Tundra Left | Direct Fit | EPA/CARB Compliant | 645398

$1,038.50

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.