I have a friend with a 140/160 with both mods. The prop tip definately
required re-pitching, and if the VSI is accurate it climbs as well as my
Cherokee 180.
Not sure about cruise/top speed increases, but his plane is definately a
"strong"
climber. (Need to qualify the term "strong," and recall that this is,
after all, a
Cherokee).

Does AMR&D have two different prop mods?

A friend bought his prop from them, and it's billed as a "speed prop" --
which it achieves at the expense of climb.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"