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by Pastaman on July 2nd, 2003

Pastaman

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Do those big, noisy mufflers I see on all the Civics actually improve performance?

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  • by d5kenn on July 31st, 2003

    d5kenn

    Assuming nothing else has changed on the car, then depending on the design, the answer varies from "slight but negligible" to "it actually hurts performance." Normally aspirated cars do benefit from a specific range of exhaust velocity in order to achieve a scavenging effect during cylinder blowdown, and having a big, open pipe in the back takes away that advantage by reducing exhaust velocity.

    However, if they've had engine work done, then chances are a bigger-than-stock pipe is helpful in regaining the balance that was altered by the engine mods. It's doubtful that most exhaust-modded Civics are in this category though.

    Comments

    • Right on; first improve the engine, then add the new muffler to assist the mods.

      Santaanacanyon

      by Santaanacanyon on September 6th, 2003

    • Perfect answer! Exhaust velocity vs. back pressure....

      8 Jan 2004-10 Dec 2009

      by 8 Jan 2004-10 Dec 2009 on July 7th, 2004

    • Excellent answer

      Andy Is Wicked Married to Penal Colony

      by Andy Is Wicked Married to Penal Colony on August 27th, 2004

    • Yep, yep. For the question, this is the perfect answer. For Civics, the engine needs mods before exhaust is useful. But for a say... Mitsu Lancer Evo, a muffler system can definitely increase TQ and HP off a dyno.

      DenverYay

      by DenverYay on July 5th, 2006

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