Somewhat relevant to this community as I know others, including myself, cross-shopped IS-F's. It was the lack of aftermarket potential that deterred me from the IS-F. Looks like a flash is now available, and makes impressive results.
As of 1/20/2016, their test mule is making 405whp/389tq on a DynoJet without aftermarket headers. Another test car with full headers is in queue, which typically add +30hp/tq on their own.
I would be lying if I said I wasn't envious of the power with just some simple bolt-ons.
http://www.clublexus.com/forums/cl-v...e-finally.html
Dyno of before/after flash (Sorry for the large image):