Why because I know like 3 people that got turbos for their LS1's this year? Because there are two new LS1 turbo kits, just this year, for the LS1? Two years ago this list had one vendor and they went out of business (Incon Twin), now:

LS1 Turbocharger Kits:
CAS Twin www.chargedair.com
Turbolocity Twin www.turbolocity.biz
RMS Single www.4redlinemotorsports.com
STS (Rear Mount) Single www.ststurbo.com
RP Motorsport Twin www.rpmotorsport.com
Turbo Technology Single www.turbotechnologyinc.com
Turbo Technology Single Turbo RACE turbo tech ls1 race system
Quarter Mile Performance Single www.ls1motorsports.com

Soon to be Released:
Pro Turbo Kits Single Turbo www.proturbokits.com
HP Performance Single Turbo www.turbochargedpower.com