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08-29-2011, 11:18 AM
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CC Member
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Join Date: Oct 2008
Location: Lions Bay,
BC
Cobra Make, Engine: CAN-AM cobra, 460 SVO
Posts: 326
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Not Ranked
active exhaust systems- quiet when you want it.
I've been toying with the idea of replacing my current sidepipes (a bit ugly, and very loud). I like the loud, but it would be nice to have a quiet, stealth mode option (I know, ear plugs are cheap, but hard to hand out to people as you drive by them in the neighborhood...)
I've seen a few "active exhaust" variable valve systems, that have a butterfly valve that closes at lower RPM to lower sound levels quite significantly it seems. They would for sure require some degree of customizing to work on a cobra, has anyone had experience with either of these, or something similar?
HYPERFLOW | Intercoolers | Catch Cans | WRX | FORD | Active Exhaust | — Active Exhaust System [AES]
Dynomax® Performance Exhaust | Mufflers | Dynomax VT™ Muffler
Automotive Questions and Answers -
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Mark
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08-30-2011, 12:48 PM
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CC Member
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Join Date: Oct 2008
Location: Lions Bay,
BC
Cobra Make, Engine: CAN-AM cobra, 460 SVO
Posts: 326
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Not Ranked
109 views, someone on here must have experience with this kind of thing!
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Mark
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08-30-2011, 01:35 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Buy a Honda!
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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08-30-2011, 02:44 PM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,295
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Not Ranked
Drilling some holes in the butterfly and just use it as a restriction. Out of the neighborhood flip the switch and have full flow.
Here is another one...
3" Dual Electric Cutouts
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Scratch build 289 FIA see the Scratch builder forum on CC - sold
DRB GT40 MK1 red #49- sold
FF5 Mk4 #7733 302/T5/IRS - dark blue - sold
FF5 MK4 #7812 427/TKO/IRS - Guardsman Blue - sold
FF5 MK4 #8414 501/TKO600/48IDA Ollie the Dragon #91 - sold
FF5 Daytona Coupe 347/TKO/IRS Homage CSX2299 Viking Blue - sold
SPF 2063
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08-30-2011, 07:28 PM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,295
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Not Ranked
Quote:
Originally Posted by mpanten
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hmmm...minus 7dB of 110?
__________________
Scratch build 289 FIA see the Scratch builder forum on CC - sold
DRB GT40 MK1 red #49- sold
FF5 Mk4 #7733 302/T5/IRS - dark blue - sold
FF5 MK4 #7812 427/TKO/IRS - Guardsman Blue - sold
FF5 MK4 #8414 501/TKO600/48IDA Ollie the Dragon #91 - sold
FF5 Daytona Coupe 347/TKO/IRS Homage CSX2299 Viking Blue - sold
SPF 2063
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08-31-2011, 12:32 PM
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CC Member
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Join Date: Feb 2005
Location: Perrysburg,
OH
Cobra Make, Engine: SPF #298 427 FI
Posts: 497
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Not Ranked
Quote:
Originally Posted by G-Pete
hmmm...minus 7dB of 110?
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Im not necessarily saying that one, in fact im not sure which one beacuse im not even sure which kind are in mine. I do know that I can drive down the road and have a conversation with someone and dont need earplugs. Its still plenty lound and mean sounding when you want it to be. The original owner said he picked up hp with them but i cant verify that. |
08-31-2011, 04:49 PM
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CC Member
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Join Date: Sep 2008
Cobra Make, Engine:
Posts: 109
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Not Ranked
I have these;
Patriot Exhaust H3200 - Patriot VaraFlow Tunable Mufflers - Overview - SummitRacing.com
Expensive, but I like them. Don't know if they could be adapted to a cobra. Maybe. 2 1/2" is a little small for a big block, but it's the only size available.
Essentially a glass-pack with an electric flapper valve.
It just so happens, when at my first track day earlier this month, I got a noise violation warning (exhaust open.) It was incredibly loud, while pushing the engine hard. Much louder than the small block cobras, GT40 replicas, and the new roush mustangs.
Problem is, when you close the valve, it does knock off the engine power. I was about 10-20 mph slower on the long straight. Bad for trying to catch 80%+ of the cars who were supercharged.
Video, with the exhaust closed - as you will hear, pretty quiet, for an FE.
Thunder 1967 Shelby Roush Track Day Aug 8 2011 Driving Instruction - YouTube
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http://youtu.be/1x63nB64zyM
Thunder
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