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 1988-1983 Oldsmobile Cutlass Supreme | Direct Fit | EPA/CARB Compliant | 642353

$328.52

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 1994-1988 Chevrolet S10 | Direct Fit | EPA/CARB Compliant | 642335

$574.90

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 1995-1989 Toyota Pickup | Direct Fit | EPA/CARB Compliant | 642334

$508.90

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 1993-1990 Volvo 240 | Direct Fit | EPA/CARB Compliant | 642316

$530.08

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 1992-1987 Jeep Wrangler | Direct Fit | EPA/CARB Compliant | 642311

$479.56

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 2003-2002 Mitsubishi Lancer Rear | Direct Fit | EPA/CARB Compliant | 642297

$737.44

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 2002-2001 Kia Rio | Direct Fit | EPA/CARB Compliant | 642296

$424.44

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 2007-2002 Saturn Vue | Direct Fit | EPA/CARB Compliant | 642295

$940.10

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 2005-2001 Saturn L300 Rear | Direct Fit | EPA/CARB Compliant | 642294

$1,492.54

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 2001-1997 Ford Explorer Right | Direct Fit | EPA/CARB Compliant | 642293

$1,024.80

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 2005-2000 Subaru Outback | Direct Fit | EPA/CARB Compliant | 642291

$1,342.80

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 2006-2003 Hyundai Tiburon Rear | Direct Fit | EPA/CARB Compliant | 642290

$704.04

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.