A while ago, when PSR had a sale, I picked up a Beatrush/Laille under-tray for the car.
I did an oil change yesterday (after the recent track day), and figured it was a good time to fit the undertray too.
Not much to say about it really - you remove the stock tray, install two "risers" from underneath the chassis, a bar across the front to hold the front in place, and screw the undertray to the mounting points.
One thing it doesn't do is come up inside the front wheel wells the way the stock plastic tray does. I'm wondering if this will lead to more water/dirt/crap getting up into the engine bay this way (I can touch the front O2 sensor from the right side now without removing anything, and I may cut up the original front tray (or grab one from a wreck) and see if I can't put something in place to cover the sides.
Otherwise, it looks decent from underneath, and may help tie the front-end together a tiny bit (as it provides some bracing between the front lower control arms):
The round hole is perfectly located to let me drop oil (via my Fumoto oil tap) without having to remove the under-tray - of course, I have to remove it to get to the oil filter...
