Classic Chambered Exhaust

[bermblaster41]

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]

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

[redd]

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

[Dwight]

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]

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]

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.

[JAM1775]

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]

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]

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]

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]

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]

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

[vector1]

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.

[CHRIS DAMSCH]

Sparks,

I know Keith Craft was doing these, a bunch of the Texas guys have them. Also I think Performance Engineering behind Dynamic Motorsports in Ohio was doing them also.

[lippy]

Any new users/additional experience with the Classic Chambered CobraPacks?

I'm considering using either the 2.5" x 24" or 3" x 24" with the 482 SO (600 HP +/-) Brent is building for me. I am specifically interested in the noise levels at highway speeds for the 2.5" and 3". Obviously the 3" is less restrictive, but I'm thinking the 2.5" may be easier from a noise perspective yet a big flow improvement over stock.

[FUNFER2]

I have the 3" and you'll need it for your HP/TQ to decrease the back pressure. Remember, at highway speeds you'll hear more wind noise than the exhaust. I love my system, size, increased HP & TQ,......and the great noise. Plus, in a Cobra, expect it !

I personally think if anyone complains about the noise, or as far as that goes, wind and rough ride, sell it for a Cadillac.

[jpetran]

If you go to the for sale items (on page 2 now), you will see the flowmaster mufflers that I have to sell. There is a description on that page that tells you about these mufflers on Jay Leno's cobra. Just google "jay leno's flowmaster" and you will be able to hear them. I had over 100 db of noise on each side of my cobra, which is way to loud. Plus these gave me that mellow sixties hot rod sound that I love. Check it out. Thanks, Joe (CSX-4507)

[lippy]

Originally Posted by jpetran

If you go to the for sale items (on page 2 now), you will see the flowmaster mufflers that I have to sell. There is a description on that page that tells you about these mufflers on Jay Leno's cobra. Just google "jay leno's flowmaster" and you will be able to hear them. I had over 100 db of noise on each side of my cobra, which is way to loud. Plus these gave me that mellow sixties hot rod sound that I love. Check it out. Thanks, Joe (CSX-4507)

Joe, so which Classic Chambered sidepipes are you using? And how is the volume at cruising speed?

[jpetran]

Hi Jeff:



My pipes were the original ones that came out of the shelby factory in vegas. All I did was cut out the middle section ( 3 and a half inch by 24 inches) and weld in these flowmaster units (4 and a half inch by 30 inches). Then I had them ceramic coated. The db's went down to 90 in the driveway, but if I stand on it, it still gets nice and loud. I wanted to drop the db at stop lights and along side other people on the road. I also got a small increase in horsepower with these and that was verified by flowmaster. I looked all over the market on what was available and it just seems that a lot of people were just playing games with inserts, cones, and the like. I needed something permanant

[RET_COP]

Ron It doesn't make sense. Louvers facing toward the engine "shear" off exhaust and direct it into the outer chamber vs. the reverse direction and a smooth movement of gasses over the louver. Just the word Shear makes me cringe. I'll take the smooth way over the "shear" way any day. It's like putting a vane on the intake valve guide in the runner. It goes in the direction of smooth flow. I can't imagine it any other way