New System on the 460
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New System on the 460
What type of gains could I see by just creating a 3" inch true dual off my manifolds oppose to waiting to afford the headers. I currently have a 3" single inlet Flowmaster, 2 1/4" dual outlet, with a high flow cat. From what i already have, it seemed to really open things up, but would running a true dual off the manifolds be more noticable? I know not having the headers is a big deal, but its something that i cant really afford. The truck is a 1995 F350, with a 460ci motor. Also, would not running cats make any differnce in flow and performance, and noise? I am looking to run the Flowmaster Dual Exhaust Universal Kit, all mandrel bent 3 inch, with H pipe, with Super 44 mufflers. Thanks
Last edited by FordF350Baby; Jun 7, 2007 at 09:36 PM.
Fleet Mechanic
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From: Simi Valley, CA
i doubt youd notice a difference, even the best exhaust kits can only free up a few hp, and there are so many variable in exhaust that are difficult to account for that i doubt youll notice much if any gains from a true dual setup and what you have now.
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How is that tho, that would be opening up the exhaust twice as much...Thats 6 inches of free flowing exhaust, beside the manifolds restriction. Right now its a a y pipe, into 3 inch, i dunno, I just like to have a nice crisp system regardless of power gains, I also want to be bad *** louder
Fleet Mechanic
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From: Simi Valley, CA
yeah itll be louder and sound real nice, but really the only thing that will give you maximum noticable power is no exhaust, straight pipes no cats or mufflers (but thats illegal), and you can take the cats off, but it wont improve your performance, modern cats are hiflow, if you take em off itll get louder though, so if you get the true duels and cut the cats, it will sound very very nice, speciall with your big block in there, but gains wont be seen too much cuz your still running through mufflers, you might expect to see 1, 2 maybe 3 possibly more hp increase, but it wont make much difference in that big truck, although its opening up the exhaust you run each side through the mufflers, and the h pipe equalizes the pressure, so its not much of a hp gain, itll sound bad *** for sure though, id do it for that alone, but remember no cats is illegal everywhere, its a federal law, not a state law, which means federal consequences if you get caught not state consequences, just something to think about
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Some excellant points you have there. What type of fines may I run into? Do cops have the knowledge ot be able to see that there is no cats? I think I will just run the cats, but in the mean time, would maybe running say a 4 inch cat, if they make one, help free up more noise and flow?
Postmaster
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From: Clarksburg WV
You could have any exhaust you want behind the manifolds and it wouldn't make much more of a difference. You might gain a couple horsepower but it'd hardly be worth the cost. The manifolds suck and are gonna be the biggest bottleneck.
Save your pennies and get some longtubes, with a crossover pipe and whatever mufflers you want to run, and you should see some nice gains (as well as MUCH better sound)
Save your pennies and get some longtubes, with a crossover pipe and whatever mufflers you want to run, and you should see some nice gains (as well as MUCH better sound)
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around here, cops cant say anything about not having a cat on anything 79's back i beleave? if they didnt come stock, u dont thave to have them here. they like to start ***** but the judge always throws it out 
tho when i put my true dule 3'' smoke stacks on mine, it freed up a pretty good bit of power from the single 3'' weed burner that was on it.
tho when i put my true dule 3'' smoke stacks on mine, it freed up a pretty good bit of power from the single 3'' weed burner that was on it.
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I would like to get the headers, but there so expensive. $700 for the headers, and who knows how long to get them professionally installed. But i guess its for the best, but i just cringe to get some noise from my truck, more so then i have now. I have been trying to get headers since last winter, but i can never get myself to drop that much on a part. The system installed would be $2,000
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2 grand?! forget it dude. i have a 97 350, but it has the 351. im running true duals on it, but since they were true off the manifolds, i cut after the o2 sensor, added a Jegs manual cutout to each side, then a magnaflow highflow cat to each side, and then i have a Schoenfeld 8" glasspack on each side. they were 16 bucks each and way louder than flowmasters. then i run em straight out the back with like 3 or 4 inch tips that i got from my buddy. its all 2.5" pipe. i got it done at a local Meineke muffler shop for about 400 bucks. the parts were maybe 300. it is very loud. i can hear it over the loud hum of super swampers, if that says anything to you.
http://a1racing.com/index.asp?PageAc...S&Category=206
http://a1racing.com/index.asp?PageAc...S&Category=206
Postmaster
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From: Clarksburg WV
$700???
The only headers I see for your truck that are that expensive are ceramic coated Hooker Super Competition longtubes, Gibsons, or Thorleys. Regular Super Competition headers are $470 and probably would just require you to relocate your O2 sensors (Dynomax sells reducers with the bungs already on them, and lengthening the wires is easy).
Or, hell, just get some Hedman shorties ($250) and have the shop run true duals back from them.
The only headers I see for your truck that are that expensive are ceramic coated Hooker Super Competition longtubes, Gibsons, or Thorleys. Regular Super Competition headers are $470 and probably would just require you to relocate your O2 sensors (Dynomax sells reducers with the bungs already on them, and lengthening the wires is easy).
Or, hell, just get some Hedman shorties ($250) and have the shop run true duals back from them.
Last edited by ghunt; Jun 11, 2007 at 11:40 AM.
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My figuring on the headers was if i was going to do it, i was going to go full out. I didnt want to half *** by getting painted ones, or long tube headers that the tubes all wernt the same length. So as of today, I purchased a 2 1/2 inch ufit Flowmaster Dual Exhaust Kit, two high flow cats, and two Super 44 Flowmaster mufflers, and two 11 inch Flowmaster tips. THe system is going to be amazing, and I will be find with that. Were running 45 degree sweeps behind each tire.
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From: Clarksburg WV
Well, my brother had true duals behind the manifolds on his '89 F-350/460, with super 40's and a crossover, dumped right after the rear axle. It sounded sweet, but the drone at 2000 RPM would give you a headache.
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From: Simi Valley, CA
if you get tired of it you can always put more pipe all the way to the rear bumper, or put smaller pipes on, not that hard to fix, or you could add an exhaust dump, they range in price from 50 bucks to the kind you literally uncork by removing a plate that blocks the cut out, to $400 for the push button cut out with butterfly valves, they run the gammit so maybe that is what you want, you can run it uncorked when you want the sound and power and when you want to run it quiet, and legal, you can cork it back up and its no big deal, thats what i think i am going to do, check out summit and stylinconcepts for cut outs
Last edited by bla1879; Jun 13, 2007 at 09:22 AM.