LT's and ORY. O2 simms or exstensions?
 

I am installing a set of Pacesetter LT's and and ORY on my 98Z and was wondering if I just need to go with the stock O2's with the exstensions or do I need to get the O2 simms to keep from throwing a code and to keep everything running right? Your input would be appreciated.

there are four o2 sensors, two before and two after each cat. you need the extensions for the pre cat sensors and simms for the after cat sensors. you shouldnt put simms on the front sensors.
btw, i know with my pacesetters i didnt have to use any extensions

Ok, havent been under the car yet to see 4 O2 sensors but will new pacesetters be equipped with holes for the 4 O2 sensors? Or will the Y-pipe have holes for 2 O2 sensors also? I am looking at a TSP Y-pipe.

I just did a pasesetter LT and TSP y-pipe install on a buddies 02 SS We used extensions for the 2 pre cat O2's and sim's for the post cat O2's There are NO holes for the post cat O2's unless you get new bungs and have them welded on