why 2 cat. conv.???
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Senior User
Joined: Jul 2007
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From: ct
why 2 cat. conv.???
do i need them both.
was thinking about running NO exaust.
i love the sound, but wondering if backpressure will hurt my 302.
can i cut off the 2nd cat??
was thinking about running NO exaust.
i love the sound, but wondering if backpressure will hurt my 302.
can i cut off the 2nd cat??
Last edited by stumpbuster; Jul 17, 2007 at 08:04 AM.
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My truck has no cats and has true duals into there own glasspack and out the back. I think it sounds as good as or better than straight pipes because you here too much tinging and poping with straight pipes. Mine also has (I think 18x3 1/2) tips. It sounds great and has alot of cackle and is pretty loud.
hope this helps
p.s Mine seams to run better without the cats on it.
hope this helps
p.s Mine seams to run better without the cats on it.
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you will lose torque with that engine unless you run full pipes to the rear.
about the cats, magnaflow makes a "direct fit converter" for this truck, that costs about 200 bux. it is not direct fit however, you will have to do a little bit of modifications. It is 50 state certified, so you stay legal. i've done it on my truck, makes your exhaust louder, and there is no restriction with this cat, so you aren't losing horsepower with it in place.
about the cats, magnaflow makes a "direct fit converter" for this truck, that costs about 200 bux. it is not direct fit however, you will have to do a little bit of modifications. It is 50 state certified, so you stay legal. i've done it on my truck, makes your exhaust louder, and there is no restriction with this cat, so you aren't losing horsepower with it in place.
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From: Suffolk, VA USA
I did the Magnaflow high-flow cat conversion because my stock converter in my 86 5.0 EFI was clogged. Interestingly, when I cut off the stock system I found that in reality it had only one cat...the one at the rear of the front pipe. That first chamber that looked like a cat is empty. It's some sort of collecter that does nothing more the channel the exhaust from two pipes to one.
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From: Hawkeye Country
My 82 and 86 both had two cats on them, all 4 had catalyst material inside of them. Both of my old trucks saw improved gas mileage and power with new exhaust setups.
On my 82, 300 6 cyl, i ran a 2.5 inch straight pipe off the factory down pipe. No cats or mufflers, it exits through a 3 inch chrome tip in front of the right rear tire.
On my 86, 351 V8, I ran a set of long tube headers, and true 2.25 inch duals with a set of glass packs. both pipes run down the passenger side and both exit out infront of the tire through 2.5 inch chrome tips.
I lost no bottom end power on either truck. It was like night and day on my 351, I'd do it just for the sound let alone the power and mileage increase.
On my 82, 300 6 cyl, i ran a 2.5 inch straight pipe off the factory down pipe. No cats or mufflers, it exits through a 3 inch chrome tip in front of the right rear tire.
On my 86, 351 V8, I ran a set of long tube headers, and true 2.25 inch duals with a set of glass packs. both pipes run down the passenger side and both exit out infront of the tire through 2.5 inch chrome tips.
I lost no bottom end power on either truck. It was like night and day on my 351, I'd do it just for the sound let alone the power and mileage increase.
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Former ******
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From: Salt Lake City, Utah
Originally Posted by ri_truck_guy
I did the Magnaflow high-flow cat conversion because my stock converter in my 86 5.0 EFI was clogged. Interestingly, when I cut off the stock system I found that in reality it had only one cat...the one at the rear of the front pipe. That first chamber that looked like a cat is empty. It's some sort of collecter that does nothing more the channel the exhaust from two pipes to one.
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From: Suffolk, VA USA
I'm pretty sure it wasn't clogged with platinum, paladium, or rhodium. And I couldn't turn up a single instance of a direct fit dual converter replacement for a F-series 302 until the 1995 model year. The mid eighties 5.8 HOs had duals, as well as the 87+ EFI 5.8s. But the 4.9s and 5.0s don't show a dual until 95. And as I said in the earlier post, there was no evidence at all there was ever anything in that front collector.
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From: Salt Lake City, Utah
Well, you are not looking in the right catalog then. My OEM catalog shows factory dual cat setups from 1984 - till they discontinued the 5.0L in the F-series. By OEM, I don't mean direct fit aftermarket, I mean original Ford parts. Same with the 4.9L. The 5.8L had the same setup on standard models, but the super duty models (over 8500 lbs) used the large torpedo style unit.
Your back converter was clogged with the pulverized remains of the front converter. I see it all the time. This is a rather common failure.
A front collector would be pointless. Think it through, do you really want turbulence coming off a y-pipe? Why would Ford engineer a pointless collector. It would cost more than a regular y-pipe. Any eveyone knows a nice smooth transition from the y-pipe produces more power and a better sound.
Your back converter was clogged with the pulverized remains of the front converter. I see it all the time. This is a rather common failure.
A front collector would be pointless. Think it through, do you really want turbulence coming off a y-pipe? Why would Ford engineer a pointless collector. It would cost more than a regular y-pipe. Any eveyone knows a nice smooth transition from the y-pipe produces more power and a better sound.
Last edited by Bear River; Jul 18, 2007 at 02:33 PM.
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From: Virginia
Here's some systems you can buy, and I would assume they match the original? Or they may be certified to do the same thing as the original. Anyway, there are several with single cats, and the 48-5598 does have a weird looking y piece.
http://www.lmctruck.com/icatalog/fd/0090.asp
http://www.lmctruck.com/icatalog/fd/0090.asp
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From: Suffolk, VA USA
I've got a 1986 Ford Emissions & Engine Diagnostics Manual....the one that's about 6 inches thick. That should tell us with reasonable certainty at least for the truck in the original question. When I get home this weekend I'll look it up. I had found the same LMC info Dave had found.
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From: Salt Lake City, Utah
Originally Posted by Franklin2
Here's some systems you can buy, and I would assume they match the original? Or they may be certified to do the same thing as the original. Anyway, there are several with single cats, and the 48-5598 does have a weird looking y piece.
http://www.lmctruck.com/icatalog/fd/0090.asp
http://www.lmctruck.com/icatalog/fd/0090.asp