I have a 03 mazdaspeed protege5 hatchback with the 2.0t. Just blew the bottom end. Not sure if its just a thrown rod or a spun bearing. But i was looking at doing either a 2jz, 4bt, sr20 or a b18 swap. Was looking at the 4bt cuz u just dont see that and u can get alot of power out of it. But i can also get a rebuild kit for it for about 450. Any ideas on what i should go with.