Hello, I drove FJ's with and without the TRD exhaust.I liked it enough to order it on mine.The basic difference is the ability to allow the exhaust to exit more efficiently,thus decreasing backpressure.It's really not much different from the aftermarket cat-back systems being offered.I prefer to stick with Toyota when I can. By the way,gains of 10 to 12HP and an extra 15lbs./ft. are not uncommon.Add the TRD cold air injection kit and enjoy even better performance. I hope this helped. cruzrman
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