not sure what is wrong with your PP2, but i noticed right off the bat after install the difference. lots more power off the line. i go through the first 3 gears faster then before. i don't regret at all.
i have the lifetime subscription which i purchased back in 2006. it was offered back then for $400. i got it as soon as howard stern made the switch to sirius. i play it in the car through the sirius app. very happy with it.