purpose of rear diffuser?

[tibra1]

Varis is really the only real functional diffuser that i know of..but it will only begin to yeild dividends at high speeds..BUT it looks badaaasss

[ProfessionalPro]

35 more hp? What dark magic is this?

[Insanerb25]

Originally Posted by wuzupfoo

unless you get one of those that extend under the car to help with airflow.. it is for bling factor only..

Lol "Ruhrmann & Zhang (2003), who tested diffuser angles within a wider range of 5 to
20 deg, with moving ground."

I think science argues with u.....hate to bump but showed up in Google and couldn't resist
http://www.bvmotorsports.com/diffusers.html