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Well I think 20 Horse Power is a lot maybe 2-5 hp I could believe if it changes the whole Symantec of your car setup such as fuel mixture and all the other good stuff like that.
There is currently NO ECU tune available for our domestic GS's. The reason being that Lexus will not release the codes for tuners to be able perform the ECU tuning...sorry to burst your bubble. For that matter, there is NO piggyback that works WELL with the factory ECU either...this is of course, very annoying, since Mitsu and Subura totally open up their factory ECU for tuning.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.
Mod chip +20hp?
maybe 2-5 hp I could believe if it changes the whole Symantec of your car setup such as fuel mixture and all the other good stuff like that. 
