Although cyanogenmod starts it's life with the code provided by the Android open source project, the final product is far from AOSP, i don't even think cyanogenmod would boot with a AOSP kernel. But i think were all agreed that we would love an AOSP or Cyanogenmod rom for the XL
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My Device
HTC Sensation XL
Rom Version - 3 Musketeers Insanely Cool Sense v2.2.1
Baseband - 10.10.12_M
Kernel - 2.6.35.13