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Cat-Back Exhaust Systems | Complete Kits | HH Muffler

Cat-Back Exhaust Systems

Cat-back systems replace everything from the catalytic converter back to the tailpipe. This is the most popular exhaust upgrade - significant sound and performance improvement while maintaining emissions compliance.

What's Included

  • Intermediate/mid pipe
  • Over-axle pipe
  • Muffler(s)
  • Tailpipe with tips
  • All clamps, hangers, and hardware

Benefits

Performance - 10-20+ HP from improved flow

Sound - Dramatic improvement in exhaust note

Legal - Keeps factory cats, 50-state legal

Easy Install - Bolt-on, 2-4 hours typical

Cat-Back vs Axle-Back

Cat-back systems offer more performance because they replace more of the exhaust. Axle-back systems are easier to install and more affordable, but provide less flow improvement.

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Frequently Asked Questions

What's the difference between cat-back and axle-back exhaust systems?

Cat-back systems replace everything from the catalytic converter to the tailpipe - including mid-pipes, resonators, mufflers, and tips. Axle-back systems only replace the section from the rear axle back, typically just the muffler and tailpipe. Cat-back offers more performance gains and sound change; axle-back is easier to install and more affordable.

How much horsepower does a cat-back exhaust add?

Most cat-back systems add 10-20 horsepower on naturally aspirated engines by reducing exhaust restriction. Turbocharged and supercharged vehicles often see 20-40+ horsepower gains because forced induction engines are more sensitive to backpressure. You'll also notice improved throttle response and a more aggressive exhaust note.

Is a cat-back exhaust legal and will it pass emissions?

Yes, cat-back systems are legal and emissions-compliant because they retain the factory catalytic converters. Since all emissions equipment stays in place, there are no check engine lights or emissions test failures. Cat-back systems are the most popular exhaust upgrade because they're effective and worry-free for street use.

Do I need a tune after installing a cat-back exhaust?

Most vehicles don't require a tune for a cat-back exhaust alone. The ECU can adapt to the improved flow. However, a tune can help extract additional power and refine the air/fuel mixture. If you're also adding an intake, headers, or other modifications, a tune becomes more beneficial for optimizing the complete package.

Can I install a cat-back exhaust at home?

Yes, most cat-back systems are designed for bolt-on installation in 2-4 hours with basic hand tools, jack stands, and penetrating oil. They typically use factory hanger locations and clamp connections. The biggest challenges are rusty bolts and tight spaces. Professional installation is recommended if you're not comfortable working under the vehicle.