Pipes for B2's aren't worthless! They increase your holeshot!!! I have a Protec pipe on my B2. I may sell it but not sure yet. Provides much better bottom end. As it says on the GroupK website its difficult to get a higher top speed with the design of the B2 hull. Its a wet hull aka to much of it is in the water creating drag!
You will notice gains all over just don't expect gains in speed. With my '97 B2 I have a slight advantage with the Trim... The Trim and protec extended ride plate gives me around 2 mph more then a '96. I also run a deep open intake grate. No toploader! Ski handles chop fine and with its agressive handling it takes bouy course turns @ WOT
With my Mod 1100 engine with 44mm carbs & other supporting mods I hope to see top speeds of 57-58mph on the B2! At least thats what I have been reading.