Hilly apart from taking off who rides below 2500rpm anyway

I had a similar dip in that area, see how it dips in HP in the same area, mine was pulling timing there which stole power and torque, when we pulled a little bit of timing it flatted the dip in both HP and torque, It was pulling like 6* but we only dropped out 2 * and it stopped it pulling any timing

 

 

 

The expanded torque scale makes the dip look a lot worse.
Interesting, I did a 103/TW7 with cleaned up stock heads using the same 2-1 pipe, but I can't remember that dip.
As you say, still around 100 tq off the line !

2:1 exhausts do that on the dyno a lot. The low speed dip.:-)