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Registered
Join Date: Feb 2002
Location: DTX
Posts: 2,409
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How to quiet a muffler?
I'm currently running a 3.4 liter engine with 964 cams and a custom chip. SSIs and an M&K Gen 5 2 in/ 1 out. I'm looking to quiet it down a bit.
I guess the options are: - Different muffler (have tried B&B, Dansk and stock, and I love M&K) - Asking ben to fab something up custom (distinct possibility) - Insert in the muffler tip (just saw a thread with possibilities from car chemistry and some others Any advice? will I harm the engine at all by restricting flow? I know cats would do the same thing, but I'm curious. I'd prefer to quiet it down with a minimum of power loss as well, which might be stating the obvious. Thanks.
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89 Carrera 3.4 "There is a right way to go around a corner - it's called the line." -- PCA DE speaker bryteside.com - good things happen. |
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11-20-2011, 11:44 AM
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RETIRED
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Weld a disc type Supertrapp on the end. More discs, louder and freer flow.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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11-20-2011, 12:04 PM
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Registered
Join Date: Jun 2005
Location: Obama Nation
Posts: 1,009
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IMO you should go with a new muffler - something engineered and not modified as there are performance issues. Sorry I don't have a specific recommendation but I am sure this group will give you some good options
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Member #750 Early911S Registry 1970 911E I know Where Jerry S. has his NYC Garage Yadda Yadda Yadda |
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11-20-2011, 12:05 PM
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Registered
Join Date: Jan 2004
Location: Docking Bay 94
Posts: 7,064
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I know it's been said by others before but my stock 1 in 1 out is fairly quiet.
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Kurt |
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11-20-2011, 12:39 PM
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Member 911 Anonymous
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Speedway Motors has this:
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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11-20-2011, 03:05 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,822
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My Lime Rock set up.... car sounds like a frikkin vacuum cleaner... the fan noise is louder than the exhaust.. The exhaust is a Gen 1 M&K RSR... for Lime Rock I cap one pipe, and use an elbow+baffle on the other....
 I bet if you stuck a baffle in each pipe it would be fine 
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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11-20-2011, 03:14 PM
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Fleabit peanut monkey
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Quote:
Says a 1-3 db reduction. |
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11-20-2011, 03:19 PM
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Registered
Join Date: Dec 2001
Posts: 4,313
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If you want to change the muffler I'd go with a Flowmaster 80. You won't lose any power and it's relatively quiet. We registered 92db on our 3.4 race motor.
I've played with the car chemistry and supertrapps and could feel the power loss with both. If you want to stick with the M&K you might as Ben to make you something like the baffles below. I wrapped the outside of the baffle with s/s wool. Depending on how much s/s wool you use will have an effect on how loud it is. I dynoed one of our motors with and without the baffles. I was losing 5 h.p. with the baffles. is. 
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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11-20-2011, 04:05 PM
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Da cab
Marble Grey
1981 Porsche 911 SC Targa
