that is kind of my whole situation. the b20b makes 126 hp @ 5400 rpm and 133trq @ 4300 rpms and the b18b makes 142hp @ 6300rpms and 126 trq @ 5200rpms. i am wondering if i am really going to gain anything here. i mean 6 ftlbs more but at a lower rpm and 16 less hp. see eventually i will build the motor for boost, so hopefully i am making the right decision. anyone here have an objective opinion???