Dude, one of the guys i went through ALS with had sheet metal riveted in the wells inplace of the plastic. Good idea, but i am pretty sure its not the kindest sound to hear on a rocky trail, gravel road, even a good amount of mud.
NEVER THOUGHT OF THAT. dam good idea.....:yelclap:people have also used pool noodles and painted them black jammed em in and you can't even really see them
great stuff insulation spray also works excellent