# Exhaust header design. Motorcycle content

**URL:** <https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800>\
**Category:** Shift518 Automotive\
**Created:** [December 15, 2011, 10:08am UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800 "2011-12-15T10:08:49Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![Boxersix](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boxersix/32/6327_2.png) [@Boxersix](https://forums.speedlife.net/u/Boxersix)\
**Post date:** [December 17, 2011, 9:10pm UTC](https://forums.speedlife.net/t/exhaust-header-design-motorcycle-content/261800/21 "2011-12-17T21:10:57Z")

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> [@FS: 88 Conquest TSi SHP!!!!!!!!!SOLD!!!!!!!!](https://forums.speedlife.net/t/fs-88-conquest-tsi-shp-sold/47296/19):
>
> after the collector or the X pipe in the stock system, does the “tail pipe” length matter? IE the “slip ons”.
> 
> or does all the tuning and exhaust science go on primary and/or up to the collector?

It most certainly matters but again is going to be such a finite element in the tuning I wouldn’t go nuts with it. Factor in the length of the system between the merge and the beginning of the silencer and you’ll be right on par with where you need to be. Factoring in the silencer is going to require some fluid dynamics and factoring in the rapid expansion of the pulse within the volume of the silencer body.

I’ll post more on the tuned pipe theory later, and link you some ceramic packing as well.

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