Dan, the filters work. I saw 129 on my speedo on a plowed road in appx 3/8 mile and it was still pulling hard. This was in 36 degree weather. Last night I saw 119 across a lake that had 4 inches of new WET heavy snow 38 degree weather
The most impressive thing is the midrange pull, this sled IMO lacks mid range out of the crate and these filters definetley improve in that department big time. No matter who tells you what, clutching needs to be addressed with the addition of freddies filters to optimize the increased power...BBY