Thinking about going back to cats and o2's...
 

I started thinking on my gf's car, if I were to put cats back into the car along with swapping the o2 sims back to real o2 sensors that the car might start running a littl leaner as it runs kind of rich right now...plus the cats might knock down the rasp a little bit.

It has a zo6 cam, and no tuning which is causing the rich condition btw...

TireFryer