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CC Advertisers
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04-09-2007, 12:54 PM
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CC Member
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Join Date: May 2006
Cobra Make, Engine:
Posts: 44
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Not Ranked
side pipes
Does anyone in the phoenix area make quieter side pipes? How many decibals is reasonable with some very quiet pipes?
Thanks in advance,
Scott
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04-09-2007, 11:15 PM
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CC Member
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Join Date: Aug 2000
Location: Glendale,
AZ
Cobra Make, Engine: SPF 468ci 550HP + 150HP NX Matching Shelby GT500 650HP
Posts: 4,250
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Not Ranked
Hi Scott. I'm sure noone is ignoring your request. It's just we don't know. I'll bet Jeff Classic knows though. He is a walking encyclopedia of car stuff. He'll know where to go for pipes and mufflers too.
AZ Bob
__________________
AZCOBRA, AZBOBS Plates & JAFMO
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04-10-2007, 01:23 PM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Not Ranked
Scott,
I am building my own headers and sidepipes right now. I am using dynomax 3" ID bullet mufflers (perforated, not louvered core). I have a flange connection at the collector where I am going to insert car chemistry inserts (really just a huge, power-robbing restriction). I'll use those only when I have to have it quieter.
It will be a while but I can let you know how quiet it is on a 540 BBC when I get it all put back together...
__________________
E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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04-10-2007, 02:08 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
I tried the Car Chemistry inserts on the dyno with my 521. They cost 35 horsepower average.
They only made the car marginally quieter, not as much as I hoped, so I dont use them anymore.
__________________
6th generation Texan....
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04-11-2007, 07:58 PM
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CC Member
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Join Date: Sep 2006
Location: Highland,
MI
Cobra Make, Engine:
Posts: 221
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Not Ranked
Quote:
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Originally Posted by ItBites
Scott,
I am building my own headers and sidepipes right now. I am using dynomax 3" ID bullet mufflers (perforated, not louvered core). I have a flange connection at the collector where I am going to insert car chemistry inserts (really just a huge, power-robbing restriction). I'll use those only when I have to have it quieter.
It will be a while but I can let you know how quiet it is on a 540 BBC when I get it all put back together...
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Those are gonna be SUPER loud! Bullets are good for about 2 dBA noise reduction. You'll see. |
04-11-2007, 08:57 PM
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Senior Club Cobra Member
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Join Date: Oct 2004
Location: Roanoke,
Tx
Cobra Make, Engine: 2002 Lone Star Classics LS427, 428 CJ engine stroked to 464, 580hp/590tq at flywheel
Posts: 557
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Not Ranked
They are supposed to be loud!
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04-12-2007, 05:21 AM
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CC Member
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Join Date: Aug 2006
Location: Charlotte,
NC
Cobra Make, Engine:
Posts: 288
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Not Ranked
My car is extremely quiet compared to others I have ridden with, but only at below 3K rpm, at WOT they can hear my car in the next county. The contributing factors to this are fuel injection and racing auger inserts in the exhaust. These inserts don't really rob much horsepower and give appropriate back pressure. I have had many people look at my car and when I start it they are amazed at how quiet it really is, till I get on the loud pedal. The fuel injection does quiet it down, or so I am told, but not sure I would go EFI if I did it again.
James
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Charlotte, NC
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04-12-2007, 12:32 PM
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Senior Club Cobra Member
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Join Date: Jul 2001
Location: Carrollton,
TX
Cobra Make, Engine: JBL now SOLD
Posts: 1,735
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Not Ranked
James,
Why would you maybe not go EFI again? Performance, originality, other issues?
__________________
6th generation Texan....
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04-12-2007, 02:28 PM
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CC Member
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Join Date: Aug 2006
Location: Charlotte,
NC
Cobra Make, Engine:
Posts: 288
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Not Ranked
Quote:
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Originally Posted by jdean
James,
Why would you maybe not go EFI again? Performance, originality, other issues?
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Probably my biggest complaint is the learning curve on tuning it. Once you get it perfect it should be good, but finding somebody to tune an EFI is a PITA. If you spend the extra money for a Motec or Accel DFI control unit it would be easier to find a resource, but it certainly requires more talent than I have to get it perfect. I think EFI is probably a better technical solution for fuel management, but carb is simple to tune and sounds better, at least on these cars. Dont get me wrong, I am not against it, would just like to try carb on my next car....if I was to go EFI ever again, it would be a Mass-Flow setup.
James
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Charlotte, NC
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04-12-2007, 04:27 PM
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CC Member
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Join Date: Nov 1999
Location: Las Vegas,
NV
Cobra Make, Engine: Classic Roadster; 351W
Posts: 743
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Not Ranked
Tom at Tom's Motorsports in Las Vegas built me a set. Do a search. He also runs them on the CSX spec race cars he maintains. They are tunable too. Run them loud when you want and quiet when you need to.
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04-12-2007, 04:51 PM
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CC Member
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Join Date: Jun 2006
Location: Las Vegas,
NV
Cobra Make, Engine: 427 SC
Posts: 388
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Not Ranked
Scott, Tom's Motorsports has done a bunch of research, so he would be a good bet.
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04-13-2007, 10:30 AM
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CC Member
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Join Date: May 2006
Cobra Make, Engine:
Posts: 44
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Not Ranked
Thanks for the help and advise.
Scott
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04-24-2007, 09:15 AM
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CC Member
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Join Date: Nov 2003
Location: Mesa AZ,
Posts: 82
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Not Ranked
Scott,
When AMP was under the gun for noise restrictions and were running the decibel testing, I got a warning for being on the cut line. I installed Vortex cones at the back of the pipe which cut the noise about 3 db; not much quieter but took the edge off. The car is gone but I still have the cones and you can try them if you want.
Jim
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