I am not the expert to provide this info...
I'll post a response, since you haven't gotten one so far...but somebody with more experience will hopefully answer your question.
The general concensus seems to be the E-Series, and the Super Trapp as well, are unbeatable for dyno numbers with the EFI bikes. Don't know how they sound though (number of disc will obviously effect this). The EFI bikes, atleast the Delphi EFI, don't run well with the Thundercones, or a Thunder header. They also don't like open pipes, or very low restriction exhaust systems.
Dynoguy.com talks about the reversion issues with the Thundercones, and how they don't perform well.
You might also do a search, or scroll through the previous post, as there has been a lot of discussion on this in the past.
I'm going to install the E-series too, when I get tired of my Khrome Werks HP+ 100's, just because of the numbers they put up.
Mitch