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Performance exhaust below 100dB?
I'm in the marked looking to buy a set of performance headers with heat exchangers. This is going to be put on a rebuilt 3.4 (from 3.2) with EFI and ITB's. So I've sold the old SSI exhaust, and opting for some 1 5/8 or 1 3/4 inch outer diameter primaries.
The noise limit on track days in Norway is at 100dB at 3 feet from the exhaust tip, when revving to 4000 rpm. So: What brand / combination (Except SSI or dansk) will keep below the noise limit of 100 dB? Anybody got some experience on this? I've looked at the Hayward & Scott set, but thought I'd ask here first. Thanks...
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03-17-2013, 02:49 PM
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Join Date: Apr 2010
Location: New Orleans, LA
Posts: 1,493
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i haven't measured it but the Bursch 1 in 1 out exhaust I have is not much louder than stock.
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off. 2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver) |
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03-17-2013, 03:33 PM
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Well, I need the entire system, with two-in muffler. So that's not an option.
Hayward & scott assures me that their system will clear the noise limit, so I guess they'll do just fine.
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03-18-2013, 05:59 AM
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Join Date: Dec 2001
Posts: 4,313
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On our 3.4 twin plug w/50 PMO's I used 1 5/8" European Headers by George and a Flowmaster 80. At Infineon Raceway (Sears Point) I was 92db.
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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03-18-2013, 06:04 AM
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Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,022
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I don't think Infineon is measuring the sound at 3 feet. That is an ontrack measurement.
On an exhaust thread a couple months ago Steve Wong mentioned that someone had made an extremely quiet Bursch style exhaust using a single turbo muffler. He reported that on the Dyno it produced only 4 HP less then a wide open exhaust. That equaled the other best performing muffler which was way more expensive and WAY louder. I have a Dynomax 17749 that just arrived which I will be fabbing up a system for my B&B headers. (Hoping for stealth mode!)
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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03-18-2013, 06:14 AM
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Black bastard
