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Join Date: Dec 1998
Location: Brighton, Michigan, USA
Posts: 46
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Dual Exhaust or Single
I have an 86' Cab and I will be upgrading the exhaust system soon. Has anyone installed a muffler w/dual outlet and cut the valance? Will I gain much HP going through this change?
All advice welcome!
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Huey 86' 911 Cab |
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09-18-2005, 12:54 PM
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Driving member
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I just did this recently to my 86. The exhaust has a dual out but it can be capped to be a single. I have run it both ways and I seriously doubt it is different either way as far as hp.
It does however have a lot more growl with the dual so I left it on. I also added a euro premuffler and although I did no dyno believe it added a few more horseys. It definitely added to the sound. 
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Jerry '86 coupe gone but not forgotten Unlike women, a race car is an inanimate object. Therefore it must, eventually, respond to reason. |
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09-18-2005, 01:03 PM
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RETIRED
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If you get a nice stainless model....take the valance off completely.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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09-18-2005, 01:10 PM
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Join Date: Aug 2005
Location: N.Canton OH
Posts: 82
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The PO cut my valence to put on a dual outlet......real purdy like, so I bought a new valence and cut and capped that fake-O dual deal.
 
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79'SC Euro 90', 92' MX5 Miata 06' Dodge 3500 QC 4x4 Cummins |
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09-18-2005, 02:01 PM
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Join Date: Nov 2002
Location: So. Calif.
Posts: 94
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one thing to consider is if your car is sitting low you won't have 1 side to favor when you creep up driveways at an angle as I do. You'll soon end up with a flat spotted tailpipe. I have Ben's M&K 1 in 1 out model and a cat bypass and I can't beleive the sound - raucous. Ben also told me on his models the 2 outs don't make much difference on his models.
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RayM 86 Carrera 95 ///M3 87 924s (track) |
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09-18-2005, 02:21 PM
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Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
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noise not hp
put some single wt. cardboard up against he cut out and trace - cut that out and then trace onto the bumper/rocker sheet metal. use shears or a nibbler tool to cut out. Grind/sand the edges round/prime/paint. et voila!
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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09-18-2005, 03:00 PM
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Yes ray is right 2 outs really don't help that much if any on most makers of exhaust
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Ben 89 944,85.5 944 914-6 2.4s GT tribute. 914-6werkshop.com |
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10-02-2005, 04:53 PM
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I like the Dansk twin out. You will need it if you go to a heavily modified engine. If the engine is only slightly moded (< 25% HP increase) then you probably won't gain much except the look.
Best regards,
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Gerry 84 911 Carrera (Supercharged), 67 427 Vette , 67 XK E-type Rdstr., 56 Vette 06 Cayenne Turbo S, 08 Vette Coupe, 57 Vette, 65 Chev Nova 327 4spd 65 Chev Nova 385 Race, 85 Chevy Rollback 97 Ford Exp. EB, 90, 91 Toy PU |
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10-03-2005, 06:55 PM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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If you want more HP, save your money. If you want to be loud and obnoxious and deprive others of their reasonable right to peace and quiet, go for it
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10-03-2005, 06:59 PM
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MBruns for President
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I had a dansk dual out on my 1987 Cabriolet with a dansk euro premuffler and loved it - great sound - nice pick me up with a Steve Wong Chip - nice burble at idle - wailed like a banshee at WOT. Just loafing around town actually sounded pretty civil - no resonance - and could talk to my passenger (and cell phone with the top up) - With the B & B I have on there now - can't make the same comments.
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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10-03-2005, 07:10 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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looks clean to me.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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10-03-2005, 08:35 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
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Re: Dual Exhaust or Single
Quote:
Find a car to ride in that has what turns you on and then decide. Don't compare your engine and cam with another engine that has a cam w/overlap and higher compression. Enjoy the adventure.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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10-03-2005, 08:43 PM
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Join Date: Jul 2005
Location: Canton, Ohio
Posts: 397
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Jeremy,
Nice car, but I would imagine that license plate doesn't attract too many ladies
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wahoofan '72 911T Targa |
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10-03-2005, 08:43 PM
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Join Date: Oct 2000
Location: agoura hills, ca 91301
Posts: 2,634
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Quote:
Bwah hah hah har har har!!!!! That was pretty good! On the other hand, he could be the "she." Kidding! |
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10-03-2005, 10:29 PM
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1986 Porsche carrera coupe 3.2
Da cab
1957 Chevrolet Corvette
2008 Chevroletc Corvette
1965 Chevrolet Nova
Cheetah
Gone to California
Turbo
