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Well, the mufflers sound great but don't add much HP. The RMM LSD [next on my list] should drop you about 0.4 seconds 0-60 and the same in the 1/4.
Our cars seem to vary, sometimes significantly, in base HP and how they react to intakes and such [there are a lot of threads describing exactly this]. I would recommend baselining your car on a dyno or at the track. As they say, your mileage may vary.
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.