They have a web site, xtrememotorwerks.com, I also left thier phone number, I know of a couple places that have developed or developing turbo systems for Vipers, this is the second I have heard of doing SRTs. (the only other one is you John)
West Coast, Heffner, SVS, Hennessey, Elite, are all doing gen2 twin turbos, DLM I heard is also working on system. I just posted this as they do specialized turbos for cars boats and motorcycles. I do not have the dyno chart, but Carl can provide it to anyone with an SRT that is interested. No NOS, but they did do head work and lowered the compression.