[lunarhighway]

that looks really great!

for oil changes you might cut a rectangular hole in the right location and make a small hatch

i'd be interested to see what improvements you get...

my undertray is much smaller and although i don't have enough data to be sure i'm suspecing a 1.5 to 2.5 % improvement, wich is what i expected

personaly i'd be a bit worried about the exhaust heat... maybe you want to use some thin aluminum in those areas.