wahoo i have the ebay one! i didn't really notice a difference other then the change in the rev limiter with the chip..i'v wanted to drop in a different one just to compare, but i don't know anyone who wants to, nor have i asked but it would be interesting to do in just 1 car, swap the chips arround... but the "claimed" gains will not be as good as the high $ chips you see, i'd say 5hp max.