DRincon- I read some of the posts where some seem to have the K&N and pipe and a jet kit but only running 148. You say a stock is 152, so it seems like they should be running a much larger jet. The pipe and filter will have one running very lean. At least that was the way it was on my Raptor. It has dual carbs and different sizes on each one. ( I think around 135/and 140. I am now running 155/and 160. This is a huge step so it makes me wonder if they are not running lean by going down to a 148. Curious