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04-17-2011, 06:09 AM
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CC Member
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Join Date: Jul 2010
Location: Augusta,
MO
Cobra Make, Engine: Sold ERA FIA 2139, 331 Weber IDF
Posts: 279
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Not Ranked
Mufflers
I plan on installing undercar exhaust with side exit on my FIA. The space where the muffler fits is small (13" x 9"). I found two mufflers that would fit. A turbo style by Cherry Bomb and perforated tube/packed style by Magnaflow. Which of the two would be quieter?
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04-17-2011, 06:59 AM
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CC Member
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Join Date: Dec 2004
Location: Kansas City,
KS
Cobra Make, Engine: jbl
Posts: 2,291
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Not Ranked
louder out the back might be better then resonating under your arse.
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04-17-2011, 07:15 AM
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CC Member
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Join Date: Jul 2010
Location: Augusta,
MO
Cobra Make, Engine: Sold ERA FIA 2139, 331 Weber IDF
Posts: 279
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Not Ranked
True, ERA designed rear suspension supposedly does not have the space available for rear exhaust.
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04-18-2011, 10:36 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,483
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Not Ranked
Look at Spintek mufflers. They make a low profile (only 3 in. thick) model that fits in the space. I don't have my printouts with me but for the model number but this is what I plan to use for undercar exhaust.
I don't know this for a fact but the Spintek muffler may be quieter than the others. It looks like a conventional baffled muffler. But again I haven't actually used them yet.
Last edited by DanEC; 04-18-2011 at 10:40 AM..
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04-18-2011, 11:01 AM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 2,993
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Not Ranked
Any under-car muffler must be short enough to fit between the outriggers - about 14.9" between them.
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04-18-2011, 11:10 AM
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Senior Club Cobra Member
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Join Date: Mar 2000
Location: St. Augustine,
FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
Posts: 1,912
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Not Ranked
wolf k,
I use the Spintechs too. Here's their web site: SpinTech Performance Mufflers - Mufflers - SpinTech Performance Mufflers
I bought an off-the-shelf size from them at first; turned out to rattle because I didn't allow for movement of the mufflers while the car is moving. It's been a long time (eight years?) but I dimly remember needing at least 3/4" clearance between the muffler and anything else solid. A bit more is probably better.
When I got my second set, Spintech made them to my specs for a very reasonable extra fee, and they're still doing a great job eight years and 27K miles later.
Mine exits before the rear tires so it's still noisy, but it's a lovely sound!
Tom
__________________
Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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04-18-2011, 12:52 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 894
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Not Ranked
FWIW , I have had the Spintech mufflers on my F150 , 5.4 L engine for about 5 years. They have a great sound , but aren`t cop callers . WOT is deep and loud , but not objectionable .... much better than Flowmasters and nowhere as loud . Should sound good on a Cobra .
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04-24-2011, 01:27 PM
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CC Member
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Join Date: Jul 2010
Location: Augusta,
MO
Cobra Make, Engine: Sold ERA FIA 2139, 331 Weber IDF
Posts: 279
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Not Ranked
Spintech did not have any off the shelf that would fit, decided to go with Magnaflow.
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