Hi their, I had a BA turbo ute that the motor started knocking badly so instead of replacing it with another bad ba turbo motor (weak + overpriced) I fitted a bf NA engine instead with injectors , cat , middle muffler removed , intercooler, valve springs etc basic mods + custom tune to suit !!. You need todo this if you don't want it to pop. Made 300kw at the rears on 10psi could have made more as it made power easily but I didn't want to run more then 10 psi because na engine went very well and sounded a lot tougher with na engine a lot more torque off boost where you mainly drive it got around 450kms a tank with 60 pound injectors. It has traveled around 20,000 kms to my knowledge and still going. Its mainly in the tune to keep it alive, a lot of people said it couldn't be done on this forum I did it anyway and was happy with the results. Hope this makes it easier to decide Also it helps that my tuner has done a lot of ls1 turbo conversions on stock internals they have 10 something compression to 1 And was more then happy to give it a go