dual exhaust set-up on 99' R/T..

[dakotart360]

hey guys, i need your help...i'm having my local performance shop bend me up some tru dual mandrel exhaust for my truck...i'm using 2 40 series flows and two hi-flow dynomax cats...my question is what do i do about the O2 sensors??...theres 3 in total; one on each pipe comming from headers and one in back of factory cat...the two i can figure out but where does that third sensor go???..i'm planning on running a crossover pipe after cats...maybe in that...i guess i'm thinking somewhere after converters...the guy has to weld in the bungs so i need to show him exactly...i just don't want my MIL light to pop up on me after install...lol...any help would be appreciated...

[carguy2]

Ive got true duals on my Dakota. I only have two O2 sensors on my truck, but it should be relatively the same. The first thing you need to make sure of is that the converters are OBD II compliant. If they aren't it won't matter where you put the rear O2 sensor. Just have them mark on the frame where the old one is. Also have them make where the old cat ends. These need to be the same distance from each other, or the light will come on. You only need to do the O2 sensor in one pipe, this will keep your light out. Ive had mine for 2 months now, and no problems so far. P.S. Do you really want your truck that loud?