I have a K&N wide mouth which lays just over the front can and have ridden in some rain on the highway with no issues to mention. One bout was for about 45 minutes straight heavy enough to cause several electrical annomolies to occur but nothing concerning the engine or as if I was ingesting a ton of water. Rain the lighted back up to normal rain and still no issues running wise.
2011 White Vision - Nuvi 550, Lowers, Lloydz 2nd filter, Vic perf filter, CB/Icom, 96 Brake LED's, Clear Signal lens/Switchbacks, VIC Hwy Pegs, Stebel Horn, 7Jurock 15" Shield, PCV, Lloyd ATS and Variable intake, Ness honkers
2004 V92 TC - S1 flash, level 1 slip-on, Ness big sucker K&N, ISO Grips, 4x1.5 Highway Hawg Risers, extra chrome (never too much), JM 2k CB 4' antena, Mustang seat, HD Front TS & Lowers, OD Pulley
Retired Navy SCPO