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 1Likes
09-12-2012, 05:34 PM
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CC Member
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Join Date: Nov 1999
Location: Sunnyvale,
CA
Cobra Make, Engine: Early Contemporary 427SC w/ '66 427s.o. (car built in '79) by Snow White Rods (Fresno, CA); XKE Series II front/rear suspension (AMP lower A-arms/half shafts), CWI rebuilt IRS, 4-spd Toploader, PS Engineering knock-off rims.
Posts: 102
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Not Ranked
High flowing and loud as I can get it (radical as all hell too)...I like kicking off alarms and not being able to hear anyone when I shut the engine off...hell, I can't hear now anyway due to the "LOUD" music from yesteryears...
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George 
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09-13-2012, 06:37 AM
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CC Member
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Join Date: Jun 2010
Location: Lewisville,
TX
Cobra Make, Engine: BDR, 302
Posts: 273
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Not Ranked
Quote:
Originally Posted by rpatton3
I am getting 304 stainless 3" mufflers grafted on my Backdraft's sidepipes. I am also getting a three bolt flange in front of mufflers, just in case I wanted to disturb the peace.
I will be 60 in November and my hearing is still good after lots of shooting guns and open headers in my youth.
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I also had new SS mufflers welded in to replace the BDR mufflers. Great sound and freer flowing. I used the 3" ID polished stainless. Great upgrade. The old BDR had a restrictive baffle with two small pipes. |
09-13-2012, 11:19 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
Quote:
Originally Posted by GLS-BDR226
I also had new SS mufflers welded in to replace the BDR mufflers. Great sound and freer flowing. I used the 3" ID polished stainless. Great upgrade. The old BDR had a restrictive baffle with two small pipes.
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where did you get the mufflers from? Looking to do the same on mine.
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Mark
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09-13-2012, 01:19 PM
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CC Member
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Join Date: Jun 2010
Location: Lewisville,
TX
Cobra Make, Engine: BDR, 302
Posts: 273
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Not Ranked
Quote:
Originally Posted by xlr8tr
where did you get the mufflers from? Looking to do the same on mine.
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I got them from Stainless Specialties. http://www.stainless-specialties.com/ Took about 1 1/2 weeks because they were backed up on orders. Great quality and sound. Talk with John.
Although some said 3" ID would be too loud, I think they sound just right. But I have a 302. If you running a bigger motor it may be too loud: 
Last edited by GLS-BDR226; 09-13-2012 at 01:42 PM..
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09-13-2012, 03:38 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
I had the Stainless Specialties on mine with 460 and it was great. But then I'm deaf as a post according to my wife.
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John Hall
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09-13-2012, 04:00 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
Quote:
Originally Posted by Silverback51
I had the Stainless Specialties on mine with 460 and it was great. But then I'm deaf as a post according to my wife.
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 i'm gonna be deaf as a post soon John- were yours with the 3 inch core? Which way did the louvers face? Any idea of the muffler length?
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Mark
Last edited by xlr8tr; 09-13-2012 at 04:02 PM..
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09-13-2012, 04:17 PM
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Senior Club Cobra Member
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Join Date: Jun 2007
Location: Covington,
wa
Cobra Make, Engine: Superformance # 532, 466 BB, 560HP
Posts: 3,027
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Not Ranked
It was the three inch core. Not sure on the louver direction, and they were 24 inches in length.
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John Hall
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09-13-2012, 04:34 PM
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CC Member
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Join Date: Jun 2010
Location: Lewisville,
TX
Cobra Make, Engine: BDR, 302
Posts: 273
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Not Ranked
Mine were 27" long not counting the turnout or the 3" inlet pipe. I couldnt really tell the direction of the louvers but I already had the turn outs welded on by SS. But you could easily roll a baseball thru it.
Last edited by GLS-BDR226; 09-13-2012 at 07:22 PM..
Reason: Add info
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09-13-2012, 06:07 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
thanks gentlemen, I'm thinking 27"+ length with the 3" core, louvers forward, and experiment with putting small spiral inserts into the 3 1/2" tip section like these: Spiral Turbo Specialties:
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Mark
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09-13-2012, 08:03 PM
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CC Member
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Join Date: Jun 2012
Location: Naracoorte,
SA
Cobra Make, Engine: CR Cobra 3169
Posts: 818
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Not Ranked
My exhaust guy says, if you face the louvres forward, it will burn out the matting inside.?
JD
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09-14-2012, 08:52 AM
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CC Member
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Join Date: Jul 2011
Cobra Make, Engine:
Posts: 65
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Not Ranked
Active Exhaust 3 - 4 DB
Active Exhaust offers the best of both worlds . Loud as Race Exhaust and Mellow as a Street Exhaust...
Systems for GT40 and 427SC are going to be offered on DPS Products web site (under construction). I have a vid clip of one system. Their system (patend pending) has changes in sound levels 3 - 4 DB. They also retain stock diameter,and vintage looks.
I can send it to anyone that would like to see it.
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09-14-2012, 11:21 AM
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CC Member
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Join Date: Feb 2011
Location: Milwaukee,
Wi
Cobra Make, Engine: 1968 GT350, FFR Daytona Coupe
Posts: 114
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Not Ranked
Side Pipes
Lippy:
Order the quietest ones. It seems you re a sensitive kind of guy and wouldnt like the loud ones.
The Nut
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Enough is enough. Too much is just right ( C.S )
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09-14-2012, 02:41 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
Quote:
Originally Posted by 4SECA
Active Exhaust offers the best of both worlds . Loud as Race Exhaust and Mellow as a Street Exhaust...
Systems for GT40 and 427SC are going to be offered on DPS Products web site (under construction). I have a vid clip of one system. Their system (patend pending) has changes in sound levels 3 - 4 DB. They also retain stock diameter,and vintage looks.
I can send it to anyone that would like to see it.
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PM sent!
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Mark
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09-14-2012, 02:47 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
Quote:
Originally Posted by Jaydee
My exhaust guy says, if you face the louvres forward, it will burn out the matting inside.?
JD
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IIRC, the stainless specialties ones use a high temp ceramic matting, not fiberglas: can anyone verify?
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Mark
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09-17-2012, 04:43 PM
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CC Member
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Join Date: Dec 2004
Location: Yorba Linda,
CA
Cobra Make, Engine: FFR, V8, Manual Trans, Htr, Wipers, Radio Delete
Posts: 327
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Not Ranked
Stainless Specialties uses a perforated core not a louvered core like most others, so it doesn't matter which way you install them. The matting is whatever John says it is. I'm not going to cut them open to find out, especially considering what they cost. 
Frank
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FFR - V8, Manual Trans, PS, Inop Wipers, No Radio, Gas Mileage so-so
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09-17-2012, 04:59 PM
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CC Member
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Join Date: May 2003
Posts: 1,313
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Not Ranked
+1 on the loud.
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09-17-2012, 06:32 PM
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CC Member
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Join Date: Apr 2008
Location: Melbourne,
Vic
Cobra Make, Engine: Some polish thing... With some old engine
Posts: 2,286
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Not Ranked
I'd go the quieter ones... You can always tickle the throttle if you want to be anymore obnoxious to your fellow road users  
Enjoy |
09-17-2012, 06:32 PM
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CC Member
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Join Date: Feb 2006
Location: Hermosa Beach,
ca
Cobra Make, Engine: FFR, CHP 427w Streetfignter, Injected Venom.Mass-Flo...550 hp , 550 torq..spec pulley sys..
Posts: 361
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Not Ranked
Lippy
Lippy. I don't know what kind of car you are into but I have a FFR and after awhile, it got too loud for most anyone, enthusiasts included.....they wear out. So, I tried all sorts of 'quiet' solutions and for me, it either didn't do enough or too much, and I didn't want to lose any HP that I paid so dearly for in the beginning. So, I went to Lance Stander in Irvine and asked if he would sell me a set of SPF pipes? They are nice sounding, and just subtle enough to keep the noise acceptable. We had to "mod" them to get them
right but after 20K later, they still work great. Just FWIW.
fred z
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Passion......"many things in life will catch your eye....but only a few will catch your heart......follow that one!"
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09-17-2012, 09:22 PM
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CC Member
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Join Date: Apr 2012
Location: Bay Area (Peninsula),
CA
Cobra Make, Engine: ERA 427, 427/487 side-oiler
Posts: 1,248
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Not Ranked
Quote:
Originally Posted by Fred Z
Lippy. I don't know what kind of car you are into but I have a FFR and after awhile, it got too loud for most anyone, enthusiasts included.....they wear out. So, I tried all sorts of 'quiet' solutions and for me, it either didn't do enough or too much, and I didn't want to lose any HP that I paid so dearly for in the beginning. So, I went to Lance Stander in Irvine and asked if he would sell me a set of SPF pipes? They are nice sounding, and just subtle enough to keep the noise acceptable. We had to "mod" them to get them
right but after 20K later, they still work great. Just FWIW.
fred z
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Thanks, that's good info. Which pipes did you originally have on your FFR, and which SPF pipes did you replace them with? |
09-18-2012, 04:43 AM
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CC Member
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Join Date: Aug 2012
Location: Grand Rapids, MI,
MI
Cobra Make, Engine: StreetBeasts, 331 Stroker
Posts: 149
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Not Ranked
20K...really? Wow.
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