What's the difference between early and late cat delete pipes?

[Dave80GTSi]

Originally Posted by jaykay

Found a couple of 99611110105 manifolds. I assume these are the ones you used on your 3.2 heads and fit the circuit werks on the back. Did the standard 3.2 tune work for you. If so where did you put your pre cat O2s? Would it not be too cold back there? I am assuming you extended all four sensor leads to get back to mid pipe cat......

I had ECU Doctors down in Florida do a ROW flash, which eliminated the need for the secondary O2 sensors. Then the remaining pair of primary sensors were fitted to the existing O2 bungs in my Circuit Werks secondary non-cat pipes, using the cable extensions which I've shown above.

Several years later, I've been very pleased with the results - No error codes, and a notable increase in power and rev-ability over stock.

[jaykay]

Originally Posted by Dave80GTSi

I had ECU Doctors down in Florida do a ROW flash, which eliminated the need for the secondary O2 sensors. Then the remaining pair of primary sensors were fitted to the existing O2 bungs in my Circuit Werks secondary non-cat pipes, using the cable extensions which I've shown above.

Several years later, I've been very pleased with the results - No error codes, and a notable increase in power and rev-ability over stock.

I see, yes ROW would do it. Did you somehow remove the secondary leads such that they could be put back if needed?

[Dave80GTSi]

Originally Posted by jaykay

I see, yes ROW would do it. Did you somehow remove the secondary leads such that they could be put back if needed?

Yes, of course - every time that I make a mod like this one, I always retain all OEM parts and pieces such that the mod is easily reversed should future circumstances change.

[jaykay]

Oh okay I was under there and one could just plug the unused receptacles with an old plug with leads removed and expoy sealed for moisture.....cut it off of and old o2 sensor