727 issue i think?

Ok so I had my exhaust done today and trailered it to the shop. Drove it home and didn't have one issue. I didn't change anything?? The only change was going from open header to 3 inch all the way out the back. Went into second and no dragging or holding back at all? What the heck is going on?

Nothing obviously. :D

Sorry, I had to.

Could it possibly be fluid temp that is making the difference?
(Like cold fluid releasing the band slower than hot fluid)