thats debatable
EGR was installed only in supras shipped to US and Europe
if it had anything to do with safety(eg pinging) i'm sure japs would put it on all supras.
Here is the quote from supras.nl:
First thing to remove is the EGR cooler. I assume you won't put it back on your car, unless you live in California and you have to pass the yearly emission checks. Over here in Holland you will pass without the EGR system, so this is a good idea. You really don't need the EGR system and removing it removes weight from the vehicle as well. And that's good for you gas mileage, so saves the environment! Yeah right ;-) Note the EGR system only limits the NOx gasses on idle. It does not help CO, CO2 or CH emission checks. In the Netherlands, cars before 1992 must only pass CO checks, so the EGR system is not needed here. Please check how this applies in your country before removing! An other arguments for removing the EGR system is preventing the intake manifold from getting black on the inside (bad airflow after loads of miles)
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