5.9 Magnum exhaust/intake combo help

FWIW, according to the MP catalog, the M1 dual plane is a idle to 5600 power band.
We know the RPM is a 1500 - 6500 rpm range
The M1 single is a oddly listed at 2600 - 6600. I say this because I also have the W5 version of that intake and it is listed as a 2600 - 7000 power band. Considering this intake is said to be an upgraded copy of the stella Bolley Stip Dominator that also has that M5 power band or better, I don't know why or see where the stock headed version gets shorter in it's rpm range.

But there ya have it.