I have to do some work on my exhaust so it will pass inspection next summer, (no cats) and I thought while I have it all ripped apart, I might as well put in some headers. Its a 96 auto with a 302 and 4x4 short bed single gas tank.


Existing setup: 2” (inside diameter) true duals into Flowmaster mufflers and strait out under the bumper.


Planed setup: Long tube headers into existing pipes with hi-flow cats and hex tips.


My questions are:

1. Can long tubes fit this model? If not will shorty’s be worth it?
2. What cats should I get?
3. How much will the cats change the sound?
4. Do the hi flow cats need pipping and sensors?

~Thanks

 

When I get back I can take some pics.

 

I'm not the exhaust expert, but your going to need a cross pipe between the duals. X pipe or y pipe. The x pipe or y pipe aids in exhaust scavenging which helps the engine breathe. Maybe Dr. Bowtie or one of the others will chime in with "professional" explanation.

 

yeah you cant run true duals the O2 sensor needs to pick a reading from both sides of the engine, plus it is very hard to work around the transfer case/front driveshaft in a 4x4. I would get some shorties an a high flow y-pipe.

 

I already have true duals. I don't have a cross over pip and I have 2 o2 sensors.

 

what madness is this! how do you run 2 O2 sensors?

 

I'm just as puzzled as you! It came with that setup. Hmm... Maybe that has something to do with the fact that I'm only getting 13 mpg. For all I know it might have been cut and the wires shoved somewhere.

 

Didn't really answer your question. There's one right behind each manifold.

 

I think the 96's actually came stock with dual 02 sensors I'm sure this has been gone over before.
Anyway I'd run and h-pipe, they help build torque and helps flow velocity, though an x pipe brings even more velocity but less torque

 

When I have it all ripped out I might add one then.