I don't have any LPE package. I just used the same supercharger they install which is made my magnusson and sold as a MagnaCharger Radix.
I installed it with the help of a friend in my garage. I will be doing a few other things in the future to drop deep into the 14's with the strip times.
My next mod is installing factory 2005 GM electric fans which ought to net me 12-15 RWHP. After that I'm looking at a slightly smaller pulley to get up to about 8.5 psi boost. I'll be looking to add a cooler thermostat as well because it will help efficiency and fight the engine heatsoak into the supercharger. Beyond that I will install a heavyduty Trailblazer torque convertor for a little higher stall speed and bulletproof the transmission. Once those are complete I will remove torque management from the programming.
If I went so far as to do heads and cam I could definitely be running well into the 13's. I'll probably go there eventually, but I'll take my time on that.
There is no real magic involved in going fast no matter what you are running. Just research the parts available and put together a good plan or send it to someone else who has already done so (LPE, Breathless, etc).
With an agenda like this I don't have any time for billet
Cory