The regular Piranha is great for digging. No need for the pro version. I liked my piranha bar so much i added the straight one to my arsenal. Both will put more material in your bucket. I use the straight one when I am working around the yard to move loam etc. when i'm in the back woods on my property I use the Piranha with the cutting teeth. Once you drill out the holes on the side of the bucket, you are ready to go with either bar. BXpanded will ask you if you have either of their bar installed, then they will build another to perfectly match.