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Old 05-11-2014, 06:44 PM   #166 (permalink)
jedi_sol
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Join Date: Mar 2009
Location: Tustin, CA
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2013 STi *SOLD* - '13 Subaru Impreza WRX STi
Subaru
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90 day: 26.59 mpg (US)

1996 Geo Metro *RETIRED from Ecomodding* - '96 Geo Metro Base
90 day: 58.68 mpg (US)
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Quote:
Originally Posted by Eastwood View Post
Totally not an expert, but I think conventional wisdom would say to extend the lip all the way across.

Also, since you've made the underbody of your STI much flater than it was before, have you considered fabricating some rear diffusers? Maybe like this: DIY Rear Diffuser : The Writeup - NASIOC ?
Thanks for showing me that write up! Yes, diffusers is ultimately in my planned mods, however, i never started making them yet because i think i read that they actually create downforce, which is bad for fuel economy.

None of the "extreme" eco cars on here or from car manufacturer concept drawings utilize rear diffusers. I am still doing more research.
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