Which of the 3 K&N filter set up provides the most performance, and has anyone seen a dyno to verify the claimes? If there is no significanr difference then which is the easiest to install?? Thanks in advance, JIM

K&N part number RU-2970   Amazon has or had them for $29.80+ free shipping

http://www.amazon.com/K-RU-2970-Universal-Rubber-Filter/dp/B00062YQXE/ref=sr_1_1?ie=UTF8&s=automotive&qid=1205989722&sr=1-1

I didn't dyno the dif, but trust me there is one.  I used the lunchbox and rejetted and wow.  It's still an underpowered little 500, but it's more respectible now.   

Could pull the front end up before but had to try hard.  Now I have to try a low less.  I should point out that my qty of wheelies is minimal, but it's a good guage for power.   

Im shocked mine cost me 50 pounds , or 100 bucks!!! just foir the lunchbox, cheapest i could find it here

Yeah those overseas really cop it with K&N prices!!!

$110 AUS ($99 US ) is the cheapest I could find from a retailer (then they told me its out of stock).