For instance, this is a Derale filter (huge unit, great filter, good looking housing):
http://www.etrailer.com/Accessories-....html?feed=npn
$45, and it is plug and play with a bigger filter. Derale is the brand who makes the coolers for AMS. That is a good brand. They make other, smaller models. They range in price. Only the ones with incorporated gauges and electronics approach anything close to $130.
This is the AMS cooler, for reference:
http://www.amazon.com/Derale-15850-A.../dp/B004XONU5G
$204 brand new, and AMS wants, what $500 for their "kit" (that doesn't work). I am truly amazed at how some of these companies operate.