Originally Posted by jonnylopez
should i check up near the engine first or underneath? if the cat is clog do i have to buy a new one?
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Unfortunately, yes. As most counties require smog ck and RX-7 will not pass smog and it's illegal without.
I would ck the underneath for both exhaust and for bushings. Do not rely only on a jack, always use jack stand to secure your vehicle when you are under the car!