Question for you guys
My Jeep has had a motor change
1988 wrangeler with 1998 Chev vortec V6 engine.
Passed smog just fine 2 years ago and before.
Now they say Cat is aftermarket and not "certified" and
I have to have an OBD II cat since the motor is 1998.
I thought the year of the vehicle (Not the motor) dictated requirements?
Any help here will be appreciated