# Will adding headers increase my engines emissions?

**URL:** <https://forums.speedlife.net/t/will-adding-headers-increase-my-engines-emissions/109205>\
**Category:** SON240sx Automotive\
**Created:** [September 6, 2007, 10:07am UTC](https://forums.speedlife.net/t/will-adding-headers-increase-my-engines-emissions/109205 "2007-09-06T10:07:05Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![240coupe](https://avatars.discourse-cdn.com/v4/letter/2/e495f1/32.png) [@240coupe](https://forums.speedlife.net/u/240coupe)\
**Post date:** [September 6, 2007, 10:07am UTC](https://forums.speedlife.net/t/will-adding-headers-increase-my-engines-emissions/109205/1 "2007-09-06T10:07:05Z")

</div>

Will adding headers to my 1991 240sx increase the emissions? or decrease them due to the increase in efficiency?

---

<div class="post-metadata">

**Author:** ![Hurricane](https://avatars.discourse-cdn.com/v4/letter/h/e9bcb4/32.png) [@Hurricane](https://forums.speedlife.net/u/Hurricane)\
**Post date:** [September 6, 2007, 10:47am UTC](https://forums.speedlife.net/t/will-adding-headers-increase-my-engines-emissions/109205/2 "2007-09-06T10:47:18Z")

</div>

More exhaust flow = more emissions.

If the car runs well though it won’t make you not pass an e-test.

---

<div class="post-metadata">

**Author:** ![240coupe](https://avatars.discourse-cdn.com/v4/letter/2/e495f1/32.png) [@240coupe](https://forums.speedlife.net/u/240coupe)\
**Post date:** [September 6, 2007, 10:50am UTC](https://forums.speedlife.net/t/will-adding-headers-increase-my-engines-emissions/109205/3 "2007-09-06T10:50:42Z")

</div>

i was thinking it would do that , but would it not make the car run cleaner because it would be more completely cleaning out the combustion chamber?

Would it lower Combustion chamber temperatures. therefore lowering nox?