apples to oranges.
Most of those cars are running body kits so there is an extra 1-2 inchs hanging dow in back. I know that was the case on my Q.They cut holes instead of doing an underbelly pan.
http://ecomodder.com/forum/showthrea...q45-11402.html
I ran the underpan edge to edge front to back (with concideration for the exhaust.)
If you really want to keep as stock as possible, that's the way to go.
cutting up the bumper would garner looks....