Hi,
just wanted some opinions on changing the ba xr6 na (auto) diff to a 4.11. can get it done for $2000 drive in drive out - 4.11 lsd.
i have been told i will need a flash tune to compensate for the change in shift points. but my question is will the flash tune (changing the diff ratio) correct the speedo as well? and is this really a worthwhile mod?
I want to have a bit of an edge over a stocker off the mark

I believe the speedo won't be out as BA models take their reading from speed sensors on each wheel.

makes sense. I will look into that. thanks