My car was tuned without cats, it had a full build motor, American racing long tubes, x pipe to mufflers. I put the American racing high flow cats on to reduce the gas smell. A guy at the track i go to, told me that adding cats will blow up my engine. Does that sound right? The guy i bought it from said it dynoed at 580 wheel with a conservative tune.
Now I'm wondering if adding the high flow cats will damage the motor.