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-   -   Sidepipe volume (http://www.clubcobra.com/forums/all-cobra-talk/117208-sidepipe-volume.html)

gjcomb 09-12-2012 05:34 PM
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...

GLS-BDR226 09-13-2012 06:37 AM
Quote:
Originally Posted by rpatton3 (Post 1210560)
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.
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.

xlr8tr 09-13-2012 11:19 AM
Quote:
Originally Posted by GLS-BDR226 (Post 1210703)
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.
where did you get the mufflers from? Looking to do the same on mine.

GLS-BDR226 09-13-2012 01:19 PM
Quote:
Originally Posted by xlr8tr (Post 1210739)
where did you get the mufflers from? Looking to do the same on mine.
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:%/

Silverback51 09-13-2012 03:38 PM
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.

xlr8tr 09-13-2012 04:00 PM
Quote:
Originally Posted by Silverback51 (Post 1210775)
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.
:) 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?

Silverback51 09-13-2012 04:17 PM
It was the three inch core. Not sure on the louver direction, and they were 24 inches in length.

GLS-BDR226 09-13-2012 04:34 PM
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.

xlr8tr 09-13-2012 06:07 PM
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:

Jaydee 09-13-2012 08:03 PM
My exhaust guy says, if you face the louvres forward, it will burn out the matting inside.?
JD

4SECA 09-14-2012 08:52 AM
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.

Turbonut48 09-14-2012 11:21 AM
Side Pipes
 
Lippy:
Order the quietest ones. It seems you re a sensitive kind of guy and wouldnt like the loud ones.

The Nut

xlr8tr 09-14-2012 02:41 PM
Quote:
Originally Posted by 4SECA (Post 1210938)
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.
PM sent!

xlr8tr 09-14-2012 02:47 PM
Quote:
Originally Posted by Jaydee (Post 1210833)
My exhaust guy says, if you face the louvres forward, it will burn out the matting inside.?
JD
IIRC, the stainless specialties ones use a high temp ceramic matting, not fiberglas: can anyone verify?

Frank Messina 09-17-2012 04:43 PM
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.:eek:
Frank

CowtownCobra 09-17-2012 04:59 PM
+1 on the loud.

Dimis 09-17-2012 06:32 PM
I'd go the quieter ones... You can always tickle the throttle if you want to be anymore obnoxious to your fellow road users **) :LOL:

Enjoy

Fred Z 09-17-2012 06:32 PM
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

lippy 09-17-2012 09:22 PM
Quote:
Originally Posted by Fred Z (Post 1211480)
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
Thanks, that's good info. Which pipes did you originally have on your FFR, and which SPF pipes did you replace them with?

RedEye 09-18-2012 04:43 AM
20K...really? Wow.


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