will the greddy probec b keep my boost under control? i was thinking about getting the apex unit, but i dont want to cut into the harness. im planning on running about 15 lbs. what would you guys get?

 

Yes it will. I am using the profec B to control my apex'i rx6 turbo

 

Most any boost controller will work well with any turbo... you should be asking about its compatibility with the wastegate. The boost controller has nothing to do with the turbo, but it has everything to do with the wastegate.

Why wastegate are you using? What size is it?

Anything from a standard HKS 40mm up to a ~50+mm tial should work fine with a Profec B. Would probably even work fine with an HKS GT 60mm wastegate.