Thanks,
It is the 1140 Tuned pipe, which is the 7.5cc size rated for 40-50 according to the mac site. It is the tuned pipe, not the quiet pipe so may appear to be smaller in length. Forgot to mention that I ended up cutting off 1 7/8" total from stock header #2590.

1" off= 13600
1 1/2" off= 13700
1 3/4" off= 13900
1 7/8" off= 14200

All using APC 12.25 x 3.75 Elevation 70' above Sea Level

14200 is good enough for me but I may have been able to get more. Transition is great plus reliable...didn't want to push it too much to end up with just total top end and tempermental running engine.
Cheers
Don