Paulc19

So I have a very odd dilemma. my car is a 1987 mazda rx7 gxl, and it has all the badging to show for it BUT when I did a full vin check for it, the vin said it had a 13b.....turbo?????? didn't show if it was a gxl or a t2 or anything, just said it was a 1987 mazda rx7 with a 13b turbo.....
So I have a question: can someone (doesn't matter for what reason) de-tune a turbo 13b, make it like the NA without any major changes? This is extremely weird, if anyone has come across this problem, please give me some insight.....