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Old Feb 9, 2006 | 09:20 PM
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double glass packs???

I've got a friend who has like a 80s chevy truck with a 305. He wants better gas mileage. He thinks welding two glasspacks together will help him improve gas mileage??? I told him i'd find out. WIll it??? If not what exhaust set up would???
 

Last edited by dthompson; Feb 9, 2006 at 09:24 PM.
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Old Feb 9, 2006 | 11:11 PM
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i don't know how welding two gp's together would increase mileage. if anything, it would make the truck quieter and reduce flow. the best flow is straights...or a borla muffler...i saw a post a few weeks ago that had a bunch of setups and their flow ratings...look around and see if you can find it.
chris
 
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Old Feb 9, 2006 | 11:25 PM
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i did some searching and found it. here is a site, thanks to grclark351, that gives you some flow tests: http://www.broaderperformance.com/mu...flow_tests.htm

here also is a post that is only a few days old about glasspacks:
https://www.ford-trucks.com/forums/s...d.php?t=457106

chris
 
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Old Feb 9, 2006 | 11:29 PM
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that first link didn't work for some reason for me...try this:
http://www.broaderperformance.com/mu...flow_tests.htm
 
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Old Feb 10, 2006 | 09:36 AM
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If they are Thrush Magnums or other perftube designs they won't hurt flow but they woun't help any more then just having 1 by itself either, they will make the exhaust quite a bit quieter though.
 
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Old Feb 16, 2006 | 09:34 PM
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is more flow better for performance? but it greatly reduces sound?
 
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Old Feb 22, 2006 | 02:24 PM
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From: Prince George, B.C.
More flow is better yes. Glasspacks won't really hurt the flow over a straight pipe even if you have say 3 inline but they will tone down the exhaust quite a bit that way.
 
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Old Feb 22, 2006 | 09:40 PM
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Mileage will not improve. Headers, a taller rear gear, driving downhill only, having the passanger get out and push ect will help much more.
 
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Old Feb 22, 2006 | 11:57 PM
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Sorry Ken, but even though the passenger pushing bit does help, the extra headaches that come with them whining about it the whole time ain't worth the potential savings.
 
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Old Feb 23, 2006 | 07:28 AM
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i would go with flowmasters they are not to expensive, they sound good, and are suppose to help with horse power and gas milage but i dont know about that. i put them on my 69 ford and my 96 GMC Yukon and i like the way both of them sound
 
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