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Old May 24th, 2011, 08:13 AM   #1
FORD FLARESIDE
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Default Exhaust design

Okay, questions for those of you in the know..............:

I'm in the process of laying out a design for a custom dual 3" exhaust.
This is on my 92 Flareside which has a 500HP 460 BB now mounted into the frame with L&L long headers. I have built many exhausts, but they were pre-design, and there is no application for what I am building, this is why I am trying to learn more about Exhaust systems in general. The design is from the headers back and will require the drivers side to cross over between the tranny and oil pan (like most fords) to the passenger side so that both pipes run along the passenger side. This motor is LOUD, and I want to be able to drive it on the road and still hear the radio, but get as much performance that I can. The engine builder has recommended 3 inch duals.
  • My first question - what is the difference in tone (pitch wise) in placement of the muffler towards the Front vs. the Back of the vehicle?
  • Second question - Mufflers,.............I know what flowmasters sound like, and I don't think they will work for this application, so do you have any suggestions on a more quiet performance muffler that does not cost more then my motor did?
  • Third question - is there a major diffence in tone/performance in conjunction with the length of the tailpipe after the mufflers?
  • Fourth question - would this application be a canidate for a cross-over (H-pipe) style exhaust, or connection between the duals?

Last edited by FORD FLARESIDE; May 24th, 2011 at 09:11 AM.
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Old May 24th, 2011, 12:28 PM   #2
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My thoughts are as follows

With 500hp BBF 460 in a standard cab truck...the exhaust noise is still going to overpower any radio if your running a performance exhaust system

So go for what you like , and screw the tunes
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Old May 25th, 2011, 10:01 AM   #3
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1: I would put the mufflers more towards the back, that BBF is gonna make some heat and might be hard on mufflers close up.

2: Magnaflow ftw, I can hold a conversation @ cruise in my 650+HP stang with them and they are dumped before the axle, with tail pipes it would be scary quiet. A little more money but they are stainless and have a lifetime warranty.

3. Run tailpipes, anytime you can keep the sound waves from under the truck it will be quieter, with 3" tailpipes there will be no loss in performance.

4. A H-pipe will slightly quiet the tone down and may give a couple HP as well, I would run one if you can fit it.
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Old May 25th, 2011, 10:02 AM   #4
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You should come take a ride in my stang so you can decide for yourself
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Old May 25th, 2011, 10:10 AM   #5
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Quote:
Originally Posted by frdboy View Post
You should come take a ride in my stang so you can decide for yourself

I will take you up on that..............
Thanks for the info, that is what I needed.
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Old May 25th, 2011, 11:31 AM   #6
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the more tailpipe you have behind your muffler the quieter it will be in the cab, but the more echo you will get outside of the truck in the tailpipes. Thus making it louder.

Example, I had a mild 350 chevy, with 2.5" duals, with just turn downs behind the mufflers it wasn't super loud outside but very loud in the truck, as I added more tail pipe it got louder outside of the truck but quieter in the cab.
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Old May 26th, 2011, 09:10 PM   #7
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I have been using Magnaflow or Dynomax as of lately because I feel they are the quietest I have used yet dont hurt performance since they are a straight through muffler.

Might be apple to oranges but I had a 87 Ranger with a 2.3turbo motor and I built a single 3" all the way to the bumper. I put big Gibson muffler in the normal position and it was still to loud for my taste. I removed that muffler and put a Dynomax behind the axle where the spare tire used to be and at anything less than WOT you couldnt even hear it running! I would mount the mufflers as far away from the motor as possible.
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Old May 26th, 2011, 09:18 PM   #8
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You can also run glasspack design mufflers near the front of the system as a resonator to deaden some of the sound and then a chambered muffler further back. This should give you the quietest sound without hurting any performance or flow.
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Old May 26th, 2011, 09:22 PM   #9
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i am into loud guess its just the younger side of me. but my friend has runs dynomax and they sound good. quiet until you stand on it, he only has turndowns no pipe after.
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Old May 26th, 2011, 09:31 PM   #10
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If you're interested, I have a pair of these http://www.jegs.com/i/Dynomax/289/17...ductId=1316158 that I would like to sell. One is still factory sealed in the box and the other has a couple hours(750 miles worth) on it but is basically new.

$125

More info
http://www.dynomax.com/mufflers.php?muffler=vt
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Old May 26th, 2011, 09:36 PM   #11
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Quote:
Originally Posted by bigblockford79 View Post
If you're interested, I have a pair of these http://www.jegs.com/i/Dynomax/289/17...ductId=1316158 that I would like to sell. One is still factory sealed in the box and the other has a couple hours(750 miles worth) on it but is basically new.

$125

More info
http://www.dynomax.com/mufflers.php?muffler=vt

I'm interested, but let me check out the out the Magnaflows too...........I will get back with you.

Great information everybody.......this helps
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Old May 27th, 2011, 03:06 AM   #12
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I'll offer my $.02 since I've had 1 or 2 BBF's. A tailpipe is your freind but you also don't want to mount the muffler too close to your collectors either. Dual 3" into a single 4" is plenty and if I was you I would check out a Magnaflow diesel 4" muffler. It will be well worth the money. The biggest thing to keep in mind is that you need to get it out from underneath the body and get it as far back as you can. If you ran it out behind the rear tire on the pass side I'm pretty sure you would be happy with it.
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