is this necessary

[cash]

http://cgi.ebay.com/ebaymotors/ws/e...ewitem=&item=230263079446&_trksid=e11010.m204

or just in cold weather?
you may need to copy and paste this link

 

[rock mafia]

For wvo, yes you need heat, more than just a heated filter.

For wmo, you may need something like that when it's cold. I don't know, it has not gotten cold here yet.