# s13 rear diffuser

**URL:** <https://forums.speedlife.net/t/s13-rear-diffuser/116248>\
**Category:** SON240sx Automotive\
**Created:** [June 14, 2008, 1:51pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248 "2008-06-14T13:51:22Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Bibby](https://avatars.discourse-cdn.com/v4/letter/b/6bbea6/32.png) [@Bibby](https://forums.speedlife.net/u/Bibby)\
**Post date:** [June 14, 2008, 1:51pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/1 "2008-06-14T13:51:22Z")

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hey guys, just wondering where can I find a nice rear diffuser for my s13 hatch?

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**Author:** ![DJPyro](https://avatars.discourse-cdn.com/v4/letter/d/278dde/32.png) [@DJPyro](https://forums.speedlife.net/u/DJPyro)\
**Post date:** [June 14, 2008, 2:19pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/2 "2008-06-14T14:19:40Z")

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Like underbody one? You won’t see gains. The underbody on an S chassis is aerodynamically FILTHY… Unless you’re running a full flatbottom undertray, you won’t see gains. Just get an effective wing.

However, a front splitter will give you some gains. Fresh Alloy has a good thread on making one for an S14 (same would apply for any car)… look up “gsracer” and search for his “S14 splitter” thread, that should help you find it…

Just some additional info, since you sound like you’re looking for downforce.

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**Author:** ![Bibby](https://avatars.discourse-cdn.com/v4/letter/b/6bbea6/32.png) [@Bibby](https://forums.speedlife.net/u/Bibby)\
**Post date:** [June 14, 2008, 2:21pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/3 "2008-06-14T14:21:37Z")

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haha, thanks dude!

well…im more into the look of it…

i dont know why, i like it alot! lol

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**Author:** ![bing](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bing/32/7211_2.png) [@bing](https://forums.speedlife.net/u/bing)\
**Post date:** [June 14, 2008, 2:44pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/4 "2008-06-14T14:44:24Z")

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Sasha built a serious full undertray for his S14…

i’ver never seen anything decent for a s13 240sx.

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**Author:** ![Solarian](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/solarian/32/5514_2.png) [@Solarian](https://forums.speedlife.net/u/Solarian)\
**Post date:** [June 14, 2008, 3:05pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/5 "2008-06-14T15:05:40Z")

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It’s not hard if you want to do it, the principles are fairly straightforward. Grab some sheetmetal and some rivets and give’er. I wouldn’t suggest it on a street car though, it’s… sorta useless and silly on the street.

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**Author:** ![DJPyro](https://avatars.discourse-cdn.com/v4/letter/d/278dde/32.png) [@DJPyro](https://forums.speedlife.net/u/DJPyro)\
**Post date:** [June 14, 2008, 3:40pm UTC](https://forums.speedlife.net/t/s13-rear-diffuser/116248/6 "2008-06-14T15:40:45Z")

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I’ll be adding a front splitter to my car as it’s been seen to have noticable gains at reasonable speeds, (40mph+) so it will actually be a functional piece in spirited driving. Right now, my car is neutral from a grip and suspension standpoint, but suffers from some slight aerodynamic understeer, I’m thinking the front splitter will balance that out and keep it more neutral through mid and higher speed corners.