Well today My cat was exposed and I played around with it only to find one side is already gone and the other side seemed to be plugged. I drove the car about 20 miles and had no over heating problem just some very poor preformance. first gear is ok and the reast i had it pined and was bar;ey speeding up at 60mph it was and a dead end i had it pined for a mile and only got it up to 68. Still have the pre igniting problem though at idle so I have some way to go yet.