Hey guys, I had replaced the stock speakers with nothing but HERTZ 6x9 and they disabled the tweeter so it could be used just as a sub. They sound great with more bass than before AND I did not purchase or change any amps in the car. I've been using them for several months now and they still sound great, no amp issues ect... The speakers are from their High Energy Line and Blvd Customs is in St. Pete Florida. No they don't specialize in Lexus but they definitely know what they are doing. I am now thinking about getting a HERTZ 8" Sub (es200) but they did say I will need an amp to run that since the stock sub is 16 ohm and the HERTZ is 4ohm. I would like something bigger, but I'll need to get it priced out first.