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Registered
Join Date: Jun 2003
Location: Honeoye Falls, NY
Posts: 154
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what exactly is a "pre-muffler"
My 86 has a cat bypass going into the stock muffler. I hear reference to a pre-mufflers. Is that something that was on other model years?
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Big Hooters and 911's will always be in style |
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08-27-2003, 11:05 AM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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It is the euro pre-muffler that your hear about. It would replace your cat.
Search "Dansk" |
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08-27-2003, 11:15 AM
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It was conceived by people with egg shaped heads to spoil your fun , remove at the earliest possible convenience!
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08-27-2003, 12:19 PM
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Certified Pre-Owned
Join Date: Aug 2002
Location: Nanny State
Posts: 3,132
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Before man invented the muffler, he invented the "pre-muffler".
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'84 Carrera Coupe |
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08-27-2003, 12:24 PM
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Join Date: Apr 2003
Location: Las Cruces, NM
Posts: 2,459
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Premuffler as in secondary muffler going inline but before your normal muffler. It's used in place of the cat to help keep things quiet but provide a straight through design for better flow.
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2007 Mazda 3 hatch 1972 Porsche 914 roller with plenty of holes to fix 
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08-27-2003, 01:17 PM
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Quote:
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08-27-2003, 01:23 PM
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Join Date: Aug 2003
Location: Menlo Park, CA
Posts: 46
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technical explanation
The pre-muffler is a device used to elminate back pressure to the muffler. Inside the pre-muffler, there is a vacumn discharge pressure switch that monitors the overall equilibrium state of the pressure within the entire muffler system. This adjustable switch, when dialed in just right, can create tremendous horsepower gains, up to 30hp on a 3.0 liter motor and 50+ hp on a 3.2 motor. When used in conjunction with SteveW’s chip, many members of this board have gained 80-100 hp with this combination. Several world renowned tuners and racing outfits in the early 70s used pre-mufflers to gain an advantage and win races. Eventually many racing circuits concluded that pre-mufflers provided an unfair advantage to some race cars and banned the use of pre-mufflers in races. Amidst all the controversy, pre-mufflers are now offered by several reputable Porsche tuners. I have been very happy with my pre-muffler and I highly recommend it to others.
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'87 Guards Red/Tan Targa (SOLD) SteveW chip/Fabspeed pre-muffler/Borla muffler |
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08-27-2003, 02:33 PM
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Join Date: Aug 2003
Location: Chicago
Posts: 598
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John,
that's hilarious.
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Beethoven '88 911 Coupe |
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08-27-2003, 02:43 PM
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Join Date: Nov 2001
Location: Los Angeles
Posts: 937
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John, you need to post way more than 3 times.... do you have a link to one of those reputable Porsche tuners? I was hoping to get an original pre-muffler to match my OEM tartan sports muffler. Right now I have the Darns't replica that's made in Brazil and while its a great pre-muffler, it isn't accepted in concours. TIA.
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Scott |
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08-27-2003, 04:32 PM
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1978 Porsche 911SC Targa 3.0ltr
