There can be a problem if the current draw for the stereo exceeds the output from the alternator. Most cars are designed and released with an alternator which has an output enough to cover for the standard lighting, accessories and of course to keep the engine running. Having the alternator working at peak output would seriously compromise the life expectancy of any unit . My son bought a stereo, amplifier and sub which combined had a current requirement of about 75 maps at peak volume. The original alternator for a HQ tonner was a mere 35 amp and being in the industry I bought a 110 amp Land Cruiser unit to fit before the stereo was added. For the AE92 there may be a unit from a later Camry or Cruiser which may fit but I have never been asked to search for something suitable. I had a quick look and could not see one that would be an easy fit but something from a 2003+ Hi-Lux or maybe even a 90's V6 Accord may be adapted to work without a lot of hassle. These would give 100 and 110 map respectively. Useful if you have a nuclear grade stereo reactor on board