should I go for imco shorties
 

have a 38 cat, step hull with a 2' notch, a little bow heavy, planes off super easy, T- 575sci's upgraded to about 650hp turning 34 B-1's, with bravo x drives, top end 105 at 5400,crusies 70 at 4000, would really like to up the cruise speed but not so much the rpm's. anyone have an idea what I might expect if I go with shorties and of course a prop change probabley to a 30 5-b short tube maximus

i think you might pick up some top end speed,but not a bunch,what hull do you have?

He has an Awesome 38.

right awesome 38, been trying to figure out if it is worth spending 10k on lowers and props if I only get minimal gain or just get labbed maxinus 5 blades

You could buy empty cases, a short shaft and just install the parts you have in your current drives. But a pair of complete cases might be easier to unload, that being your current cases or the IMCOs if you don't want them.

Start with props.