FULL BORG DYNO RESULTS-6.0L LS COMPARISON, S475 VS S480. HOW TO: PICK THE RIGHT SIZE TURBO! What size turbo is right for your combination? How can the same turbo make 30 hp per psi on one combination and 20 hp per psi on another at the same boost level? Why does a bigger motor need a different (size) hot side than a smaller motor at the same power output? Is a bigger turbo always better than a smaller one?