I have not had the time to create a DIY but here is a little teaser...
I have been surviving the off season by trying my hand at some fabrication projects. Here is my homemade plywood functional front splitter. I purposely gave the splitter a 5 inch overhang but may cut it down even with the nose for eligibility to run in Street Prepared.
The splitter is supported by using longer bolts in the stock mounting holes just in front of the wheels. I also used heavy steel 8 inch angle brackets that are bolted on the front crash bar with grade 8 fasteners.
I still need to cut off the ends of the brackets but I may leave them for extra fastening points.
My supports are Allstar 8 inch spoiler support rods normally used by the circle track guys.
Here is the splitter off the car. As you can see, it fully covers the entire area in front of the front wheels. Also, try and ignore my home made diffuser in the background. That was the first time I ever played with fiberglass.
And try not to gasp at how awful my snow wheels and tires look...