I have run K&N on all of of mine for 21 years. Here is what I have found out on each car. Daily driver72 Dart 318 with 8" Volicity Stack in Mini Mopar hood scoop: Great water repelant from oil.Daily driver and NMRO Stock class 79 RC with 440-6: Kept mud and water out even though it was open housing. 07 Nitro has 130,000 and cleaned once. 07 HD Wide Glide: Freaking mess, oil everywhere in TB, even after letting it sit for "excess" to drain.01 Kawi Nomad EFI filter Failed: tear engine down to remove pieces from cylinders.75 D 100 440 with STP 305A size filter: Oil did not stay in filterand had to reapply every 2000 miles, screwed with FAST EX EFI, pulled and tossed. There are other brands that may be better without the oil mess. I prefer them due to the amout of water mine see.