foam filters are absolute junk. They rip and wear out within the first 5 times you use them. He just needs to get a K and N with a outerwear and hes all set. For years I have been running this setup and have never had a spec of dirt in my carb boot or a single problem…I wish I could say the same about my dads setup with the foam air filter. He switched over to K and N when countless times dirt would get in and the filter would rip,…not to mention more then a few top dog riders and shops have said to stay away from the foam filters,