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i too have been wanting to ditch the factory exhaust and replace with headers, i was only able to find a set of cheapies that would clear a 1989 with a 4sp, 4x4 with a 302. they do come with the bungs for the oxygen sensors too, but i am just not happy with the pacesetter brand from summit racing. i would pay more for hedman, doug thorley, hooker etc but they are not available. i would rather not keep the cats, but for the computer i guess i will have to. you 2WD guys will have better luck, i cannot even find a shorty for my application, if anyone knows of shorties or long tubes for this or has done this please let me know! thanks and good luck with your exhaust woes.
One thing that no one has brought up yet is the issue of only having 1 O2 sensor. If you do true duals the computer will only know how one side of the engine is running. That's not ideal.
Both pipes don't necessarily need to be equal length but you should install a crossover pipe to help equalize pressures.
As far as the cost goes. If you bought 2 Magnaflows at $100 a piece. Then had a shop fab the pipes from the manifolds back that shouldn't be more than about $500 total. A buddy of mine just had duals made for his old F100. From the longtubes back with the mufflers he supplied he got it all done, with a crossover pipe, for $475 including the cost of the mufflers.
One thing that no one has brought up yet is the issue of only having 1 O2 sensor. If you do true duals the computer will only know how one side of the engine is running. That's not ideal
Lol I thought of it. And I think the comp should just stay out of it.
What would be the problem with the o2 in one side? It's a 50/50 chance that what the engine is doing on one bank as far as fuel air mix goes it doing on the other. IDK.
If using a crossover should not one just use a DIDO muff?
I think an h pipe for a crossover is best from what I have read. I read that one should keep the crossover within 8-18" fro collector. I am not sure how that would work on this truck. My understanding is that the piping from headers will take same route as stock. One would have to place an h pipe in location of where the cats are.
Would possibly have to extend wiring for o2 and place in the crossover.
Anyone have any thoughts on this? Where do I get bung for o2? Is there an h pipe that would have a bung in it?
The H pipe doesn't need to have the crossover that close to the collectors. It will have to cross behind after the trans under the driveshaft.
If you have someone build the exhaust from the collectors back just have them build an H pipe like a mustang uses. This way you can easily pull it out if you need to remove the driveshaft. Check out the pic below. The crossover is way farther than 8-10 inches from the collector connections.
With true duals you can only monitor 1 bank. You can't put the O2 sensor that far back in the exhaust. It needs to be mounted either in one of the manifolds or just past the collector.
Will a setup like that pictured 2 posts above clear the transfer case and steer clear of the front tank? I just don't see it happening.
I still think the best thing you can do is the shorty headers with a good Y pipe. True duals are just unnecessary unless you are pushing some real hp - at least twice as much as what these motors put out stock.
I don't mean to be the Debbie Downer here - do what you want. But if you want to be safe and do something that is known to work, stick to the shortys, y pipe, single pipe back to muffler, and then choose your muffler depending on whether you want dual outs or a single.
It will work, sound great, and might even be something you can do most of the installation yourself.
08-30-2016, 03:02 PM
