I found area diffuser on the forum the other day, it was a concept or project still. but they had one made, the pic was on a white frs on a lift. kind of looks like this but i cant find the thread now.
https://40.media.tumblr.com/5589cb24...qbl0o1_500.jpg
If you're too scared to click link, look up voltex diffuser for a STi. thanks guys
or this
http://www.z33driver.com/images/proj...installed9.jpg