z2die4

If you get more subs for the rear, and a new amp, you will need a few parts. #1 A good quality Line Out Converter, it makes the speaker wires coming out of the radio into RCA jacks. #2 Good Rca wires.

Also, dont forget speed sensor computer, speed sensor itself. You might run into audio issues if your going from NAK to Premium or vice versa ie. amp, speaker ohm loads etc. Your better off just buying an aftermarket system. It would probably cost the same, 3k, but at least you could also play movies, have much faster mapping, and the newest software and other technology. If your capable of installing this yourself and feel comfortable removing panels and carpeting and are mechanically and electrically inclined, then go for it.

You can also get a Hard Drive update from most lexus dealers for around $250.

One thing to remember THE HIGHER THE OCTANE THE SLOWER THE BURN. You add high octane in sporty cars and turbo cars, to slow down combustion to decrease the amount of heat build up in the engine. A fast burn will increase heat and melt expensive internals.

I have never read so much misinformation in my life. Cleaner burning & Carbon Buildup High octane to low octane does not burn "cleaner". There is no additional carbon build up between regular and premium. Its more likely that gas from a less expensive refiner, such as arco, texaco is causing that problem. Using a better refiner should usually clear that problem up. Try shell, 76, or chevron, or mobil. In different areas of the country, this will be different. This is whats good in California and probably most western states. Fuel Mileage If you really think that it makes any difference in terms of fuel mileage, then you have absolutely no business posting information which other people think is from an informed person. Fuel is sprayed into the combustion chamber. At x RPM, with x intake of air, the engine computer is gonna spray x amount of fuel, regardless of fuel grade. Its ludicrous to think it will spray less of the higher grade. As stated in previous posts, the car will !Removed! ignition and cut power, but no fuel savings. There is no additional carbon build up between regular and premium. Its more likely that gas from a less expensive refiner, such as arco, texaco is causing the problem. Using a better refiner should usually clear that problem up. Try shell, 76, or chevron. You get what you pay for... Performance would probably be effected significantly. The car also might knock on hot days, or during hard acceleration. If you drive like grandma, and live somewhere cold, you will probably never see the difference between regular and premium & wonder why you pay the difference (TELL YOURSELF TO SHUT UP). Why would you want to even take a chance on your expensive investment for about $150 a year difference in fuel cost. Even slight pinging can cause major damage to your internals. DONT RISK IT. I hope this helped someone. Please feel free to comment.