# Tailpipe A/F on the dyno for tuning?

**URL:** <https://forums.speedlife.net/t/tailpipe-a-f-on-the-dyno-for-tuning/1816>\
**Category:** NYSpeed Automotive\
**Created:** [August 26, 2005, 10:12am UTC](https://forums.speedlife.net/t/tailpipe-a-f-on-the-dyno-for-tuning/1816 "2005-08-26T10:12:59Z")\
**Posts on this page:** 1\
**Showing post:** 24

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**Author:** ![rj-92](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/rj-92/32/7310_2.png) [@rj-92](https://forums.speedlife.net/u/rj-92)\
**Post date:** [August 29, 2005, 7:06pm UTC](https://forums.speedlife.net/t/tailpipe-a-f-on-the-dyno-for-tuning/1816/24 "2005-08-29T19:06:21Z")

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If you know the cat Eff’s up the readings, it has to do so in a linear fashion, hence this irregularity is predictable and can be acounted for and a correction factor applied to get and acurate reading… Correct?

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