Classic Chambered Exhaust

bermblaster41 · #1 (**permalink**) 11-29-2008, 08:49 AM

I am in the process of upgrading my side exhaust. I have heard good things on classic chambered exhaust. Do any of you guys have any audio or video links of your classic chambered exhaust? I plan on going with the 3" inner with 22" length. Any opinions or other options are welcome. Thanks Bermblaster41

undy · #2 (**permalink**) 11-29-2008, 03:17 PM

No sound or video clips but you might want to look here.. Anyone using Classic Chambered exhaust?

redd · #3 (**permalink**) 11-29-2008, 05:02 PM

go to www.classicchambered.com the have a sound byte of a cobra.

Dwight · #4 (**permalink**) 11-29-2008, 05:57 PM

Lainhart bought the 3" open x 28" for his 487 cid FE, I bought the 3" packed for my little ol' 354. We have not installed them but they look great and Classic was great to do business with. Next week I'm going to finish that project.

Dwight

bermblaster41 · #5 (**permalink**) 11-30-2008, 05:58 AM

Thanks for the replies. I have talked with Classic Chambered. The guy I talked with was real friendly and real sharp on his product. Just looking for some guys that have there product and used it for a while....any regrets? I plan on ordering in the near future just wanting to do this right. My side pipes are already ceramic coated. Just want this to be the last time I do this. Thanks Berm

Burgs · #6 (**permalink**) 11-30-2008, 06:19 AM

I had the dimpled classic chambered exhaust on an LS1 powered 02 Camaro with long tube headers. They were "standard" on the Berger Special Edition Camaros and sounded great. If I were to redo my side pipes, they would be at the top of my list! The dimple design has been around for a long time.

undy · #7 (**permalink**) 11-30-2008, 06:35 AM

Mine are of the "unpacked" 3" version and are very loud. Most people think my sidepipes are not muffled. Do I like them?? Hell yes! but.. I always drive around in fear of Johnny law and his ticket book. I plan on installing Dynatech's "exhaust cones" http://www.jegs.com/i/Dynatech/329/72-32520/10002/-1 prior to next season in hopes of lower decibles..

bermblaster41 · #8 (**permalink**) 11-30-2008, 06:58 AM

Thanks Undy. Thats the info that I was looking for.. I am sure I will go with the packed 3". I have read how guys are putting them in backwards???? The only way I can think of is to weld them up solid. Not up to doing that for an experiment. I will install them in the normal direction. Thanks again Berm

cdnus · #9 (**permalink**) 11-30-2008, 12:24 PM

undy
Dynatek site claims 1-3 db. reduction in sound level for the cones.
Hardly seems worth the effort or cost to install if a persons level is already VERY LOUD.

J.M O.

Craig

undy · #10 (**permalink**) 11-30-2008, 02:27 PM

Quote:

Originally Posted by cdnus

undy
Dynatek site claims 1-3 db. reduction in sound level for the cones.
Hardly seems worth the effort or cost to install if a persons level is already VERY LOUD.

J.M O.

Craig

I know, but most reports on various forums are that they provide a noticeable diference. I don't know how much of that is actual noise reduction or how much is "I just need to feel good about the money I just wasted" talk. I'm still mulling it over...

JAM1775 · #11 (**permalink**) 12-04-2008, 06:44 PM

I'd rather go with the 3" ( longest length) and let the rifling shape of the inside louvers do their job by facilitating exhaust velocity. Accept the added noise if you were looking for power over your old exhaust. To do otherwise by reversing the louver direction so the cups in the louvers face the motor must create turbulence. This cannot help scavenging. When I blew out the glasspacks in my FFR 2.5" ID inner tube mufflers I swapped them for the RACE LOBAKS. These mufflers have 1.5" ID center tubes surrounded by the augers which easily flowed as well if not better than my old 2.5" tubes. They idled quieter but really can bark when you stab it and scream at the top end. Lobak is 510-783-3714. $63 each I think at 26" L.
When I pulled my blown glasspacks I first installed 18" L Dynomax Race Bullets with
3"ID tubes. The motor seemed to rev faster, especially above 4500-5000rpm at WOT ...but.....but...my ears were killing me ! OMG ! One week they lasted.....before I hit them with a sawzall and installed the Race Lobaks. But they sure did make power !

Rare Iron · #12 (**permalink**) 12-05-2008, 07:45 PM

Bullets are VERY LOUD! They flow well, but are only good for 2-4 dBA's. The packing Dynomax uses in them is Owens Corning CRF fiberglass, & it is not very dense or absorbtive.

Undy is running chambered Powerstick sidepipe inserts, because his sidepipes are 4" Lake-type pipes & he needed something to slip inside. I could not build a packed muffler that would fit inside of the 4" sidepipes & still maintain a 3" flowpath - that was vital to him - to not lose HP. THESE ARE LOUD, but they sound awesome! (He knew that going in).

As far as turning them to run INTO the louvers (against the grain), this is my recommended flow for all chambered & max noise control Cobrapack applications. They will flow in either direction, but the Cobrapacks are about 4 dBA louder if you turn them around. The louvers are tiny, & they do create some drag vs. smooth perforations, but they still flow very well. The 3" internal versions flow VERY well, & the flowpath size is the important thing when limited to few options on this type of exhaust configuration. Most, if not all "stock" Cobra kit exhaust mufflers have a smaller than 2" muffler flowpath. Talk about KILLING horsepower for noise sake! As far as putting a cone or some other plug into the flowpath - well there is a tradeoff. The perf cones don't do much at all from what I've heard & read, & other objects in the flowpath just impede flow.

Most of the feedback I get? Both my 2.5" & 3" versions are just as quiet or quieter than the small core mufflers they were running in the first place, & they produce a super deep note, which is also easier to tolerate than different tones. Best of both worlds.

Sorry for posting - it's a sin for a non-advertiser to chime-in, but I thought this would be helpful to some of you. Don't buy 'em - just use my information. Thank you.

cdnus · #13 (**permalink**) 12-05-2008, 09:09 PM

Rare Iron,
What would be the approx. difference between 2.5" & 3" X 24" Cobra mufflers sound levels on a 408W making 500hp. & 550 ft. lbs.
I am only interested in the packed mufflers.
I would like to obtain max hp. but not at the cost of my hearing. As I frequently go on 100-200 mi. trips the sound level is important also.
Any help is appreciated.

Thanks Craig

undy · #14 (**permalink**) 12-06-2008, 05:12 AM

Quote:

Originally Posted by Rare Iron

Bullets are VERY LOUD! They flow well, but are only good for 2-4 dBA's. The packing Dynomax uses in them is Owens Corning CRF fiberglass, & it is not very dense or absorbtive.

Undy is running chambered Powerstick sidepipe inserts, because his sidepipes are 4" Lake-type pipes & he needed something to slip inside. I could not build a packed muffler that would fit inside of the 4" sidepipes & still maintain a 3" flowpath - that was vital to him - to not lose HP. THESE ARE LOUD, but they sound awesome! (He knew that going in).

As far as turning them to run INTO the louvers (against the grain), this is my recommended flow for all chambered & max noise control Cobrapack applications. They will flow in either direction, but the Cobrapacks are about 4 dBA louder if you turn them around. The louvers are tiny, & they do create some drag vs. smooth perforations, but they still flow very well. The 3" internal versions flow VERY well, & the flowpath size is the important thing when limited to few options on this type of exhaust configuration. Most, if not all "stock" Cobra kit exhaust mufflers have a smaller than 2" muffler flowpath. Talk about KILLING horsepower for noise sake! As far as putting a cone or some other plug into the flowpath - well there is a tradeoff. The perf cones don't do much at all from what I've heard & read, & other objects in the flowpath just impede flow.

Most of the feedback I get? Both my 2.5" & 3" versions are just as quiet or quieter than the small core mufflers they were running in the first place, & they produce a super deep note, which is also easier to tolerate than different tones. Best of both worlds.

Sorry for posting - it's a sin for a non-advertiser to chime-in, but I thought this would be helpful to some of you. Don't buy 'em - just use my information. Thank you.

Rare is entirely correct. I'm sorry if my "LOUD" response was taken by anyone as a complaint about the pipes, it wasn't intended as such. As stated, I knew they were going to be loud going into it but I wanted max flow. I'll rethink the cone thing too..

The earth shaking is just a side benifit..

bermblaster41 · #15 (**permalink**) 12-06-2008, 06:16 AM

I ordered my classic chambered exhaust on Friday. I went with 3"x24" with the packing. I will post video of before and after. Wont be able to dyno until spring. Bermblaster

RonNichols · #16 (**permalink**) 12-06-2008, 05:36 PM

Quote:

Originally Posted by bermblaster41

I ordered my classic chambered exhaust on Friday. I went with 3"x24" with the packing. I will post video of before and after. Wont be able to dyno until spring. Bermblaster

You won't be disappointed. I went with 3" x 22" to closely mimic the Superformance factory pipes. The entire power band shifted upwards from 2100 rpm's up. Completely different car from a power stand point.

What I did though is weld a transition onto the front of the cobrapack muffler to smoothly funnel the exhaust into the 3" bore. And this set still looks factory and the noise is not objectionable with the louvers facing into the flow path.

Good luck

R

MFE III · #17 (**permalink**) 12-06-2008, 07:55 PM

Ron, beautiful work on the 4-into-1 transition! Bet it flows even better than it looks!
But when you say ". . . louvers facing into the flow path . . .", do you mean against the grain as was said before?
Matt

Rare Iron · #18 (**permalink**) 12-06-2008, 08:25 PM

Wow Ron - NICE job! Wanna finish my AAR for me?

We should get-together for coffee & car stories sometime soon..............

vector1 · #19 (**permalink**) 12-07-2008, 04:50 AM

fyi using pipemax program to model exhaust on my build

the dia of the primaries was in the 1 3/4 - 2" range with length 27-30".

collectors were best hp/tq 2 5/8-3 1/2 dia. by 16, 32, or 65" long.

worst hp/tq length was 24, 48, 97.

first of importance is supposed to be primary dia., followed by collector dia. & length, followed by primary length.

seems most of the numbers i put in the program the above numbers are close.

the collector length is considered from the point the primaries merge to exit.

RonNichols · #20 (**permalink**) 12-07-2008, 06:26 PM

Quote:

Originally Posted by Rare Iron

Wow Ron - NICE job! Wanna finish my AAR for me?

We should get-together for coffee & car stories sometime soon..............

Eric,

That finish is not from me. That's QC Coatings in Utica. The coating is second to none, and the price is even better. Great guys to deal with.

To answer the other question from MFE, the louvers are basically to shear off and redirect the exhaust flow into the outer chamber, whether it has packing or not. To face the louvers the other way would not allow the exhaust to be directed into the outer chamber. The louvers, IMO, impede into the flow path whether they're facing the exhaust or not. Might as well get the benefit of the louvers.

R