# DIY Rear, anti airdam (top speed/track mod)

**URL:** <https://forums.speedlife.net/t/diy-rear-anti-airdam-top-speed-track-mod/19056>\
**Category:** Builds\
**Created:** [October 20, 2006, 8:24am UTC](https://forums.speedlife.net/t/diy-rear-anti-airdam-top-speed-track-mod/19056 "2006-10-20T08:24:13Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![MPD47](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mpd47/32/7383_2.png) [@MPD47](https://forums.speedlife.net/u/MPD47)\
**Post date:** [October 20, 2006, 10:14am UTC](https://forums.speedlife.net/t/diy-rear-anti-airdam-top-speed-track-mod/19056/10 "2006-10-20T10:14:30Z")

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> [@newman](#):
>
> EDIT: looking at the shape… the part you made may effectively ADD lift

I agree, judging by the harsh angle, I can see the rear being more squirly at speed with this. You want an undertray that goes under the chassis at a gradually increasing angle as it gets to the rear. Not something that drastically changes airflow like this, which is exactly what I mentioned to Mark online. Oh yeah, and I dont care how many MPH they give you, speed holes are FUCKING GAY.

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