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I have a 1990 LS400 and coolant disapeers while the engine is running. The car runs great, no clunking or steam out the back, but when the car is driven coolant seems to magically disapeer. There are never any puddles on my garage floor and it doesn't run hot. Also nothing drips when I let it...

I have a 1990 LS400 and my check engine light has been on since I have owned the car. I assumed it was the O2 sensors or cat seeing as the car runs fine. The problem is I am getting around 14 mpgs, the worst I have ever gotten. Is it possible that the O2 sensors are bad and causing the car to...

I have a 1990 LS400 and I am looking to get a new exhaust system. What would guys recommend as far as pipe size, mufflers, cats and resonators in order to get a nice low rumble but still be practical. Right now I am thinking 2.5" to two flowmaster 50 series, any recommendations?

Does anyone have any recomendations on lower cost, power increasing mods?

I have an 1990 LS400 with 415,000 miles on it. It has Nakamichi and air suspension (still the original). I am thinking about doing a conversion to regular suspension, anyone have any recomendations.