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 2008-2007 Chevrolet Silverado 1500 | Direct Fit | EPA/CARB Compliant | 645459

$1,266.08

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 Chevrolet S10 | Direct Fit | EPA/CARB Compliant | 645458

$1,179.18

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 Chevrolet S10 | Direct Fit | EPA/CARB Compliant | 645457

$1,130.94

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 2007-2004 Toyota Highlander | Direct Fit | EPA/CARB Compliant | 645456

$641.56

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 2006-2001 Chevrolet Silverado 2500 HD Le | Direct Fit | EPA/CARB Compliant | 645455

$1,027.42

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 2006-2001 Chevrolet Silverado 2500 HD Ri | Direct Fit | EPA/CARB Compliant | 645454

$1,136.08

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 2016-2007 Jeep Patriot Rear | Direct Fit | EPA/CARB Compliant | 645452

$1,114.00

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 2006-2005 Jeep Grand Cherokee | Direct Fit | EPA/CARB Compliant | 645450

$1,057.02

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 2005-2004 Ford F-150 Left | Direct Fit | EPA/CARB Compliant | 645449

$2,051.54

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 2006-2003 Chevrolet Silverado 1500 Right | Direct Fit | EPA/CARB Compliant | 645448

$1,281.46

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 2004-2003 Ford Expedition Left | Direct Fit | EPA/CARB Compliant | 645444

$1,260.32

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 2004-2003 Ford Expedition Right | Direct Fit | EPA/CARB Compliant | 645443

$1,544.68

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.