Totally understand the scepticism...
Check out their website..look at their dyno tests and video.
They are high end manufacturers of these systems. Remember this is a full stage 2 system with the 2nd stage CAT removed and running all the way from the manifold, not just a set of rear boxes.
http://gthaus.com/product/lexus-rc-series-2014-rc-f-v8/
Having owned 4 Lexus V8's (SC430, 2 x IS-F's and the RC-F) I know these engines well. The car is transformed with this new system, especially in the higher part of the rev range.
Anyway it is what it is.....
