I wanted to leave my N/A diff in my car also when I did my swap. But after a conversation with Ian, I put the LSD out of the 88 parts car I bought. not sure what the difference would feel like but he made some very good points about engine load and boost makeing more power than the 430 gear in the N/A diff. All of which have been covered in this thread. plus lower highway engine speed = better mileage.