No wonder my mileage has gone to hell! Anyway, is there any chance I hurt my engine, like by running to lean? Should expect any sort of amazing new performance when I get some?

 

Do you already have your pacesetter longtubes installed? Thats wierd you would have no 02 sensors and not know about it until now. Definetly order a couple AC Delco O2's.....stray away from the Bosch brand (I have heard some bad things about them) You should definately run much better with o2's in.

 

What have you heard bad about Bosch sensors?

Not having O2 sensors will only make the car run mad rich. Can't hurt a thing but your gas milliage. It will run better, but I wouldn't expect any big noticable power gains.

 

Well I know first hand that a buddy of mine had em and after like a week his car was misfiring and acting up, then he replaced em with AC Delco's and all was good. I have also read numerous posts on the subject and it seems to be hit or miss with em, some have great luck and others they don't work out so good.

 

Bosch o2 sensors are pretty much like Bosch platinum plugs for our cars. (they suck, in two words)
Get AC Delco.

 

Sounds good, AC delco it is. So theres no chance I caused any damage, though, is there?

 

No damage.