1. Welcome to PlowSite. Notice a fresh look and new features? It’s now easier to share photos and videos, find popular topics fast, and enjoy expanded user profiles. If you have any questions, click HELP at the top or bottom of any page, or send an email to help@plowsite.com. We welcome your feedback.

    Dismiss Notice

cat power loss?

Discussion in 'Chevy Trucks' started by 572bowtie, Mar 2, 2005.

  1. 572bowtie

    572bowtie Member
    Messages: 44

    do i gain any horsepower by removing my cat or will my truck be any louder?
  2. Mebes

    Mebes Senior Member
    Messages: 451

    Removing any small restriction from your exhaust (catalytic converter) will give you small HP gains.

    It is not legal in most states to remove the catalytic converter, so you may want to look into this before you take it out.

    I do not think that your exhaust system will get louder if you do remove it, because the muffler handles most of the sound.

    Hope this helps.
  3. NJBuickRacer

    NJBuickRacer Member
    Messages: 59

    You'll gain a little upper end HP, but may hurt your torque. You'll wind up running a little lean as well. Newer catalytic converters don't restrict exhaust flow as much as you think. Not to mention if you're OBD2 you need to run a simulator in place of the downstream O2 sensor in order to avoid tripping a SES light.