in the picture below you see a hole in my hood.... what could i use to build a small cowl on it so that it draws in some air... ive seen these before but it looks like some flimsy plastic i wouldnt mind it if it works... how do you make it?

 

The NACA submerged duct is very efficient.

If you have a good mathematics and fabrication background you can make one yourself. (Despite what you see written, this report is unclassified):
http://naca.central.cranfield.ac.uk/...a-acr-5i20.pdf

Or you can do it the easy way and just buy one pre-made and simply blend it into the hood:
http://www.racerpartswholesale.com/naca.htm
http://store.summitracing.com/partde...5&autoview=sku

Here is an installation article, although I'm not sure how good it is because I am not a fabricator.
http://www.revlimiter.net/mods/duct_install.html

 

thanks man, that helps out a lot
i like those ducts... but there is another one i was thinking of... if i can find the video with this car ill show you

 

Click here to see Video


that kinda cowl

 

Wow, that guy drives worse than me, lol. It sure looks like he is having fun though.

It's not very clear in that video, but it looks like a marine clam shell or cowl vent. Check your local marine supply shop.

 

he has a bad *** car though, its a 20b na.... and the dude is like 7 feet tall in a small *** fd... and when u hear it in person, its loud as hell