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Old Feb 17, 2016 | 12:51 PM
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Highboy Mufflers
What mufflers fit best under a Highboy? I was looking into the Magnaflow Round mufflers. They 20 inches over all length and 4 inches in diameter? What are your experiences or thoughts?
 
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Old Feb 17, 2016 | 01:14 PM
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Round case mufflers are easier to fit than oval case mufflers unless the oval is oriented vertically. Remember that the driveline is offset about two inches to one side so spacing between a horizontal oval case muffler get close to the frame rail and the driveshaft.


I've got those Magnaflows installed on my 2WD '70 (360FE/TKO-500). Very well made... They area as loud as Flowmaster 40s. Cab insulation/sound deadener is recommended. But "noise" is highly subjective so it's your call.
 
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Old Feb 17, 2016 | 02:30 PM
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On my Highboy the rear driveline isn't offset, its in the middle of the axle like 99% of vehicles. But round seem to fit the best
 
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Old Feb 17, 2016 | 02:37 PM
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Glass packs would be my choice!
 
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Old Feb 17, 2016 | 04:20 PM
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Ovals will work, if you have a good exhaust guy.
 
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Old Feb 17, 2016 | 07:09 PM
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True. Ovals will work if ya stand them sideways.
 
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Old Feb 17, 2016 | 09:06 PM
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I have the oval Magnaflows on my highboy in 2.5". I really like the way it sounds except for when I really get on it. It's just too much crack in it out of my 445. I'm almost decided on adding a resonator ahead of them. Here's a idle video:
 
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Old Feb 17, 2016 | 09:54 PM
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I have a pair of 30" thrush glasspacks that fit well and sound good on mine.
 
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Old Feb 17, 2016 | 10:11 PM
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That's a mean sounding 445. Thanks for the video link.
 
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Old Feb 17, 2016 | 10:14 PM
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Does anybody have any pics of round mufflers mounted up?
 
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Old Feb 17, 2016 | 11:14 PM
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On my 2WD '70 :




Moroso Spiral Flows On my 4WD '73 :


 
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Old Feb 18, 2016 | 07:05 AM
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More ideas here, not necessarily high boy...

https://www.ford-trucks.com/forums/1...t-systems.html
 
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