Do you use them? Do they help keep the road grime off your oil filter and engine? Are they worth the trouble? Inquiring minds want to know!

I have the tour fender on my bike.. comes down lower and helps keep the crud off the bike. I do plan on putting a mud flap from Timberwolf Leather on one of the other VN750s when we finish them.

Anyone know of a good mud flap that will fit nicely and work well? Only need
a front flap.