OP, I'm glad you like your enjoying the PE. Your experience just wants me to get one even more now.
To all you experts out there with PE's, I have an n54 e90 and looking to get one soon too. Right now I have my DP off, but if I do put them on again later, do you think leaving the stock e90 resonator in would help with the rasp of the PE. I would rather do that then put the x-pipe and find out I need to put a couple Vibrants in there to take the rasp out. Tried to look for a video or anything doing the same and came up empty.