engine guru's! could this cause a lean condition???
 

i think i damaged my cats a few months back when not thinking about them at the track, i put some good ole 114 octane in the car.

About two weeks later, i had to go to the dealer to get the o2 sensors replaced. they never did check the cats.

well, i went to the dyno and the car is running extremely lean. could a stopped up converter cause me to go lean and could it cause other adverse conditions to the engine