Now I am curious. How would you handle the O2 sensor with a dual exhaust?

(since tone in type can be hard to "read", I am not being sarcastic... I'd really like to know)

 

If you knew the impedance parameters and signal strengths of the circuit you could probably work up an interface circuit to sum the dual O2 sensors.

I had a 3.0 truck with headers and 32"s and a 3.0 truck with 31's and they performed similar, but the one with headers (and K&N) would tach out much faster. Definitely more responsive. I think if it had been on 31's it would have really moved.

 

+1. I could write a program on a microcontroller that would sum the signals and output their averages.

pretty cool what you can do, actually.

 

What about some kind of resistor in the 02 sensor to let it read clear, just like they do with the EGR?

 

NWOR =

 

I know this is late, but I installed the Downey headers and exhaust on a stock 3.slow last summer. I used the ceramic coated headers and the engine compartment temps are much lower. Ceramic also seems to solve the fuel/brake line issue. I measured them with an IR thermometer and they were OK.

Problems: extracting the cross-over - it can be done with a little creative use of a reciprocating saw to cut off one flange (from underneath, passenger side I believe). Mounting the reed and EGR valves - you may be better off making your own tubes. Turning the nuts is nearly impossible.

Power: definitely noticed more power in the usable high ranges. Flat at lower ranges. Selection of a muffler seems to make the biggest changes. I have gone thru several and this is what seems to affect the low-end torque. Its an overall tuning problem with the entire exhaust system. You get performance, or mileage, but not both.

Mileage: definitely up (low restriction converter in the package).