Hi, I'm new to the forum, first post but have been reading threads for a couple of months. I recently purchased a 96 LX450 with 90K. Two weeks after purchase engine light came on, code showed catalytic converters. I took it to Lexus for confirmation, $2500-$2800. for converters and 1 ox sensor. Called Toyota dealership in hopes of better pricing, service manager ref. me to a local muffler shop. Shop tech at the muffler shop told me to run octane booster through the system and run premium full before replacing converters. I reset the engine light, added octane booster and have continued to run premium through the system. It's been one month and over 3K miles and the engine light has yet to come back on. Runs like a top averaging around 15-16 miles. On another note, read the post on detailing and decided to detail my LX, bought the products recommended, followed the directions and WoW! I am so happy with the results. You guys give great info on this site, all I can say is thanks.