I may of posted some of this but a pretty easy mod is to sand the back lip off, which is better even if not doing the next step, then laying it out on a sheet of Alumalite, 6mm, tracing the lip edge, cutting it out and then fastening to the spoiler from underneath so the Alumalite is tucked behind the leading edge out of site.
I use the 4' wide end then some scrap sections as fillers, plenty of area for solid mounting those, I may of only gotten 1 undertray if I had cut full width, I have nearly enough left for two more so will make a spare.
I made it go all the way to the subframe where I used sq tubing to make a subframe brace and rear mount so I have a very big undertray.
It would work well making it not so deep or just as deep as the splitter if a points issue for a particular race class.
I made some aluminum angle mounts at the rear lower section of the radiator support and used fender washers there as well as all the rest of the mount points.
This thing works, I have great front grip into high speed corners, no push at all, very stable up to the 130 MPH I was hitting on the front straight and under braking. The only push the car had was simply from over driving it a bit on some lower speed corners and only when my tires were hot.
I did however have too much engine bay heat when I had the car at the track when I went to the Octane Academy, the Ford race shop manager drove the car around the garage area and loved it and recommended I duct some air up to help draw more out of the bay so I make a nice curved one, side panels, skirted, to blow air up towards the DP area and it helped hugely. Since it pulls more air through the engine bay it may reduce drag a bit as well had a huge cooling help.
I was going to use the fog lights for brake ducts but the opening above the lip feeds into a curved sealed channel I am going to port for the brake ducts and get to keep the fogs
I have scraped the lip more than a few times, seemingly hard enough once to bend it but nothing happened except minor scuff on the leading edge.
I am looking for a picture of the duct section I made.
