i currently have a chip thats tuned for a m6.

Since the 93 is a 700r4 transmission and shift points are calculated by the tv cable,

what exactly is different on the tune for the m6 tranny compared to a a4?

 

I have a 93 m29 m6, Gray Green metallic (I love the rare colors like mine and yours), and from what I have seen is that the spark advance table was a little different. I was comparing my neighbors 93 a4 to my m6 .bin. You of course have the tcc tables that are not used in an m6 of course. I think ther might have been a few other tables that were different. I will go back and look at them and let you know.