Just bought some pacesetter headers and y pipe tonight. I also bought the O2 extension. I don't know too much about cars so how many O2 sims am I going to need and are they specfic to a certain car or will any O2 sim work for any OBDII car. Thanks.

 

you need 2 of em

why don't you just get them tuned out? its around the same price and is guarenteed to work, as apposed to the sims which are known for going bad.