I bought a bunch of scoops from these guy's. Havn't installed them yet but thought I'd share.
http://www.oocrcracing.com/
The NACA duct is good in a 1/8th buggy side window for better motor cooling.
"If yer not 1st,yer last"
OFNA GTP w/Quark-Medusa 60mm-5s
Inferno SP2 w/MMM-1512 2.5d-5S
Inferno St-rr w/MMM-1515 1y-5s