From Roo Systems website the warranty explains their side of what it could mean to possess all that power and torque.
See Roo Systems Warranty page
I would only suggest that the brave venture forth as I would not want to be 500 odd kilometres from the nearest LR service centre when I need to discuss the matter of what has gone wrong with a stressed engine.
Maybe the Roo Systems exhaust system would be enough for most users? Just my two bobs worth...

