I thought the interference/noise filter part of the install was maybe NOT a part of the latest kit because the filter is not pictured as a part. Wrong. The filter IS included in the parts bag. I'm betting some DIY installers have put the heated grips on their bike and NOT fussed with cutting into the factory harness to install the filter. This question is for them: Do your grip heaters work satisfactorily having left out the filter? Even better would be the input of someone that tried the install without and with the filter and how did that effect the operation of the heaters. Maybe the filter is to prevent a problem showing up somewhere else NOT grip heat related? Anyone that put their OEM heaters on without the filter and then found, say, some anomaly in their dash display...that would be great to know, too. Thanks! **edit** Yes, it is a suppressor, not a filter. It's a choke wrapped around a wire. It filters nada. Call it a high frequency dampener (sic).