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03-28-2006, 08:44 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
blown sidepipes
Don,
I have blown 2 sets of sidepipes in the past 5000 miles. The first set was the old restrictive style and the second set are the new better flowing set. The second set only has about 1000 miles on them.
I am trying to figure out a sidepipe that wont blowout so fast. My engine is a 351W with a cam of 230ish intake duration @.050 and 240ish exhaust @.050. The engined dynoed at about 460 at the flywheel.
I just cant afford to be replacing pipes every few months.
Matt
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04-03-2006, 08:33 AM
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CC Member
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Join Date: May 2000
Location: Sauk Centre,
MN
Cobra Make, Engine: Owner, Classic Roadsters II
Posts: 1,347
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Not Ranked
What do you mean by blown out?
Don
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04-03-2006, 03:54 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
The insides of the new ones are rattling inside and have gottin a lot louder.
The old ones the baffle walls were in little pieces.
Matt
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04-03-2006, 04:57 PM
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CC Member
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Join Date: Oct 2003
Location: Saratoga Springs,
UT
Cobra Make, Engine: Shell Valley, 418W, tremec 3550tko, 9" ford rear, 3.0 gear, silver/black
Posts: 408
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Not Ranked
Matt,
After only two years of driving I decided that my glasspack sidepipes were getting louder as time went on. They weren't rattling yet but just getting louder!
I built a new set using Vortex cones in the collectors and Lobak spiral mufflers in place of the glasspacks and I must say they sound great!! Nice throaty sound but down on the decibel level. Photos in my gallery!!
__________________
Terry
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04-04-2006, 08:45 AM
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CC Member
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Join Date: May 2000
Location: Sauk Centre,
MN
Cobra Make, Engine: Owner, Classic Roadsters II
Posts: 1,347
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Not Ranked
Did you buy the second set from us? If you did I will replace the mufflers at N/C if you send them to me. We have been using the new free flow muffler for a few years and I haven't had any known problems to date.
Don
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04-04-2006, 08:30 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
Don,
The other day I spoke with Pete and he directed me to the manufacture of the mufflers. I spoke with them and ordered a set of 3in core to replace the ones out of the first set. I will get these back together and see if I like the sound of them. If it is to loud for my liking I will get with you on what mufflers you are using now.
By any means I dont feel that you should have to replace the mufflers for me. From the sounds of it the guys at heart throb said that it was more than likely from the UPS guy "dropping" them at my door step.
Thanks a bunch.
Matt
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04-04-2006, 08:57 PM
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CC Member
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Join Date: Nov 2002
Location: Flanders,
NJ
Cobra Make, Engine: Classic Roadsters 351 Windsor 405 HP
Posts: 1,043
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Not Ranked
Did you have side pipes ceramic coated? I did and the sound was different than it was when I put them on the first time. I think the heat of the ceramic process may have had something to do with it. They are definetly louder than they were pre coating.
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04-04-2006, 08:59 PM
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CC Member
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Join Date: Jun 2005
Location: Fairfield,
ca
Cobra Make, Engine: CRII with a Stroked Windsor
Posts: 976
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Not Ranked
Hmmm.. I just ceramic coated mine.. Maybe I should go out and start it up to see if they sound different.. It's only 8pm. I shouldn't piss off too many neighbors.. 
Nope.. their no louder than they were before.. Huh.. did you say something???
Last edited by onefastmustang; 04-04-2006 at 09:26 PM..
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04-04-2006, 09:03 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
the coating was put on them right out of the box. I ran them for a few runs last summer and no rattle but after a long 200 mile run they rattle bad. Kind of funny sounding when you are sitting a a red light.
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04-04-2006, 09:04 PM
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CC Member
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Join Date: Aug 2004
Location: Bethany,
OK
Cobra Make, Engine: Classic Roadster 302 EFI
Posts: 69
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Not Ranked
kidcobra You have a PM
Thanks CARWARS
Last edited by CARWARS; 04-04-2006 at 10:21 PM..
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04-04-2006, 09:29 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
carwars
you have a PM
Matt
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04-07-2006, 04:56 PM
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CC Member
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Join Date: Nov 2002
Location: Flanders,
NJ
Cobra Make, Engine: Classic Roadsters 351 Windsor 405 HP
Posts: 1,043
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Not Ranked
You know what you are both right mine rattle too,but only at idle??
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04-07-2006, 08:41 PM
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CC Member
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Join Date: Jul 2004
Location: Spanaway,
wa
Cobra Make, Engine: building someone elses E&M 1967 427 side oiler
Posts: 182
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Not Ranked
Well I got the new 3in core mufflers in today and will be working on them this weekend. i will let you guys know what the out come is.
Matt
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04-07-2006, 09:51 PM
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Senior Club Cobra Member
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Join Date: Sep 2002
Location: Montgomery,
TX
Cobra Make, Engine: CR 427 S/C, 351W, 5 Sp & KMP142 - 427 SO, 4 Spd
Posts: 2,212
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Not Ranked
I've had mine for 6 years , 14,000 miles and no rattles/problems yet.
Oops - I probably shouldn't have said that - it'll happen now! 
__________________
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