11:1 will not require 108 octane unless you are running a LOT of timing.
I know there are calculators out there to help determine compression ratio, but I don't have any good ones off the top of my head.
Also, research Scat a little bit. If I recall, they didn't have that great of a reputation a few years back.
2008 Trailblazer SS
LS2, AWD, Red Tint Jewelcoat, and Eff'ing dubs
Yank PTB3600, Kooks 1 7/8" LT's, 4" Fenderwell intake, LS1 E-fans, Magnaflow, LS7 TB, Sonnax shift kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds