Like your car is going to know the difference between a Bosch o2 sensor or a denso O2 sensor for the same application!
Guys, regardless of who makes the part, if it was meant to fit the car in question, it will work, period. I used Bosch parts on mazdas, NGK plugs in american cars... it doesn't matter one bit.
True, if you want to stick with original equipment, then go with denso, that is what is used in our cars from the factory, but to exclude a part because it's made by a euro-sounding company, that's just plain recockulace!!!!
Bosch, Denso, NGK, they all make quality parts... But since our cars came with iridium plugs, they should only be replaced with iridium plugs, and so far, only the JDM companies (NGK and Denso) make them. Sure, the Bosch 4-way platinums would work great in a boosted or nitrous application, but on the NA celica, you should stick with iridium.
If you're going to choose one part over the other, make sure it's for the right reason, not just because of who makes it.