performer rpm vs airgap horsepower

I can't remember where I read it (so treat this as a rumor:) ), but the HP difference between the RPM and RPM Airgap was only around 5 HP. Not enough to make a significant difference.

150.00 is a good price, but not a great price. A new Air Gap can be found on ebay for 168.00, with free shipping, is 5 HP worth $18.00?

Regards,

Joe Dokes