How to Tune a Peugeot 406

Written by chester rockwell
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The Peugeot 406 is a full-size sedan produced by Peugeot from 1996 through 2004. There are many ways to tune the 406 to produce more horsepower. Some drivers opt to install a cold air intake, which increases the efficiency of incoming air to the engine's intake manifold. Another popular way to tune your 406 is to replace the factory engine control unit, or ECU, with an aftermarket unit that provides custom fuel mapping. Installing an exhaust is just one of the ways that you can tune your 406 to produce more power.

Skill level:
Moderately Easy

Things you need

  • Aftermarket exhaust

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  1. 1

    Remove the factory exhaust from your 406 by unbolting it from the exhaust hangers at the rear of the exhaust assembly, near the muffler. The exact location of the hangers will vary according to model year.

  2. 2

    Slide out the old exhaust system with caution, ensuring you do not damage the undercarriage of your 406 in the process.

  3. 3

    Install the aftermarket exhaust by bolting it to your exhaust manifold. Use the factory exhaust installation hardware.

  4. 4

    Attach the rear of the aftermarket exhaust to the factory exhaust hangers on the underside of your 406.

  5. 5

    Turn on your 406's engine and allow it to idle. Follow the piping of the exhaust as the engine idles, listening carefully for any hissing or sounds of leaking before you take the car for a drive.

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