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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck

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Old 08-25-2012, 03:41 PM
77 2wd 77 2wd is offline
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Dual exhaust

Putting a 429 in my truck, alrighty got a set of dual headers, i need advice on what kind of dual exhaust to run, any suggestions on muffler glass packs all those goodies?
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Old 08-25-2012, 04:05 PM
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2.5" pipe, X or H pipe about a foot behind the collectors (if you can fit it) if not, true duals are just fine too, free flowing muffler/glasspack, terminate it to your liking e.g. at the rear wheels, under the bumper, etc.
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Old 08-25-2012, 04:19 PM
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2.5" pipe, X or H pipe about a foot behind the collectors (if you can fit it) if not, true duals are just fine too, free flowing muffler/glasspack, terminate it to your liking e.g. at the rear wheels, under the bumper, etc.
alright, so when i go to my muffler shop tell em 2.5" pipe with an X pipe preferably behind the collectors, and glasspacks? ive heard good things about flowaster 40's, is that what they call a certain muffler?
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Old 08-25-2012, 04:42 PM
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alright, so when i go to my muffler shop tell em 2.5" pipe with an X pipe preferably behind the collectors, and glasspacks? ive heard good things about flowaster 40's, is that what they call a certain muffler?
No. Glasspacks are just like the word says. It's made with a perforated inner tube wrapped with fiberglass packing to absorb the sound waves. Then it is inserted in a steel tube. Then the outer tube's the ends are spun down and welded to the inner tube. More accurately, they should be called "glass-packed".

Flowmaster 40s are referred to as "welded mufflers" with a thick outer casing. Inside, the exhaust flow and sound waves are deflected with baffles for sound tuning and sound absorption. Sound waves that are 180° out of phase and meet each other in opposing directions cancel each other out. Flowmaster designs their mufflers to cancel out certain frequencies while maximizing flow given the application.

If you can weld, buy Speedway Motors' mandrel bent tubing kit and fab it yourself.
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Old 08-25-2012, 04:49 PM
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I got a 460 with dual glasspacks and they sound loud and mean.
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Old 08-25-2012, 04:56 PM
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No. Glasspacks are just like the word says. It's made with a perforated inner tube wrapped with fiberglass packing to absorb the sound waves. Then it is inserted in a steel tube. Then the outer tube's the ends are spun down and welded to the inner tube. More accurately, they should be called "glass-packed".

Flowmaster 40s are referred to as "welded mufflers" with a thick outer casing. Inside, the exhaust flow and sound waves are deflected with baffles for sound tuning and sound absorption. Sound waves that are 180° out of phase and meet each other in opposing directions cancel each other out. Flowmaster designs their mufflers to cancel out certain frequencies while maximizing flow given the application.

If you can weld, buy Speedway Motors' mandrel bent tubing kit and fab it yourself.
how much would that cost?? and should i go with glasspacks or flowmaster 40's ive heard great things about both!!
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Old 08-25-2012, 05:01 PM
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A 2.5-inch mild steel kit is only $140 from Speedway... It's like $220 from Summit... save some moolah and apply what you save towards Flowmaster 40s. Around $90 apiece. Alternatively, I recall Summit just came out with Flowmaster-looking welded mufflers for about $30 each.

Personally, I avoid glasspacks because the fiberglass packing crumbles over time and all ya end up with is a 5hitty sounding ride. Relatively inexpensive yes but crappy quality.

YOU have to decide what is best for you. I went with Moroso Spiral Flows... $55 each, compact, no fiberglass, and no moving parts like Dynomax's VT muffler.. Btw, stay away from the VTs.. it's a stoopid gimmick.
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Old 08-25-2012, 05:19 PM
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A 2.5-inch mild steel kit is only $140 from Speedway... It's like $220 from Summit... save some moolah and apply what you save towards Flowmaster 40s. Around $90 apiece. Alternatively, I recall Summit just came out with Flowmaster-looking welded mufflers for about $30 each.

Personally, I avoid glasspacks because the fiberglass packing crumbles over time and all ya end up with is a 5hitty sounding ride. Relatively inexpensive yes but crappy quality.

YOU have to decide what is best for you. I went with Moroso Spiral Flows... $55 each, compact, no fiberglass, and no moving parts like Dynomax's VT muffler.. Btw, stay away from the VTs.. it's a stoopid gimmick.
Thanks!
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Old 08-25-2012, 06:08 PM
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Personally, I avoid glasspacks because the fiberglass packing crumbles over time and all ya end up with is a 5hitty sounding ride. Relatively inexpensive yes but crappy quality.
Hahaha, thanks HIO!
But you have to admit they sound good while they last!
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Old 08-25-2012, 07:19 PM
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Hahaha, thanks HIO!
But you have to admit they sound good while they last!
True... while they last.
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Old 08-25-2012, 08:03 PM
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flowmaster is deffinatly the way to go... there are also a couple different types flowmaster 40, the super 40s will be louder than the deltas... check their sight,they have a few vids for a general idea.
flowmaster alos highly recomends a Hpipe over the Xpipes for bigger motors. X pipes tend to benefit smaller motors like 4 bangers...
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Besides, you never know when the zombies will attack, and I'm gonna wanna be in the closest thing to a tank I can get my hands on.
we're all susceptible to zombie attacks. Which would you rather be in, a flower power Yaris, or a rip snorting dentside?
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Old 08-25-2012, 09:47 PM
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I lean towards glasspacks over flows. I personally think the flows sound a little odd on 460 trucks, but thats just me. If my truck had a smaller engine, say 351 or 302 I might have gone with flows.



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Thanks for the myopic criticism Montana. You're bundle of joy.
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Old 08-25-2012, 09:50 PM
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Personally I prefer the flowmaster super 40's. Love the sound.
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Old 08-25-2012, 10:10 PM
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glasspacks do sound awsome on just about everything, but the glass tends to break down. i like the idea of baffles over glass. and stainless, never buy mufflers again!
i have a vw w/ a built vr6 that has a single delta 40 and a long resonater, but still fairly loud,and when it backfires its a piggy attracting bang!
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Originally Posted by 704 dentside man View Post
Besides, you never know when the zombies will attack, and I'm gonna wanna be in the closest thing to a tank I can get my hands on.
we're all susceptible to zombie attacks. Which would you rather be in, a flower power Yaris, or a rip snorting dentside?
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Old 08-26-2012, 12:42 AM
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As far as glasspacks go it's like anything else, you get what you pay for, some are better than others.

I've been running "Jones PowerPack" glasspacks from "Full Line Exhaust" for over 8yrs (link below) and they've yet to blow out and still sound great.

They're 14 gauge aluminized steel, perforated core, which holds the 'glass' in better than a louvered core glasspack does, the perforated core also creates less back pressure.

They're also made in the USA.

Full Line Exhaust - Glasspacks
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Old 08-26-2012, 12:42 AM
 
 
 
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