Originally Posted by Z_ealot

the street kit is more expensive because it has a Setrab unit included with it where as the performance kit comes with one of stillens own in house designed oil coolers which is why it is cheaper. not really sure of the effectiveness of stillens oil cooler as i don't really know anyone on the boards that owns one, but setrabs oil coolers are among the best on the market which is why they charge a premium on any kit containing one.