Classic Chambered Exhaust

[bermblaster41]

Update on my side pipes. For future Classic chamber customers here is what I wish I had done different. I decided to go with the reducer to smooth out the transition from 3.5" down to 3". I would suggest ordering without the inlet welded in. I had to cut the weld and grind away the weld to pull the sleeve out. Not impossible but time consuming. For the guys that are not clear on the procedure look in my photo gallery for pics. The quality isn't great due to I used my phone for the pics. Progress pics and video to follow. Berm

[Rare Iron]

Berm, just chop off the muffler inlet til there is about 1/2" left. Then cut-down the 3" ID side of the reducer & butt-weld it to the muffler inlet. Then cut the adapter right where it starts to transition from 3.5" OD to the 3" & then you can grind & finesse it until it slips just inside the collector. Everything will hide inside the collector & all you'll have to do is weld the muffler to the collector. If I build the Cobrapacks as blanks (no necks), then you may not get as smooth of a transition, plus the weld at the muffler neck also secures the core of the muffler in place. Either way, if you don't have a chop saw, it makes the whole procedure a little more difficult.

Merry Christmas everybody..................

[RonNichols]

Originally Posted by Rare Iron

Berm, just chop off the muffler inlet til there is about 1/2" left. Then cut-down the 3" ID side of the reducer & butt-weld it to the muffler inlet. Then cut the adapter right where it starts to transition from 3.5" OD to the 3" & then you can grind & finesse it until it slips just inside the collector. Everything will hide inside the collector & all you'll have to do is weld the muffler to the collector. If I build the Cobrapacks as blanks (no necks), then you may not get as smooth of a transition, plus the weld at the muffler neck also secures the core of the muffler in place. Either way, if you don't have a chop saw, it makes the whole procedure a little more difficult.

Merry Christmas everybody..................

This is about how I modified my muffler. I wish I would have taken a picture when I did mine as it would have been worth a thousand words.

R

[undy]

Rare,

I'm thinking of of dumping my 4" non-packed setup I have and getting rid of the 4" collectors too. I'm thinking about a set your 3" Cobrapacks with a nice set of Kooks or Dynatech 2" primary by 3" outlet true merge collecters. I've got a couple questions about the swap, if you will. How much horsepower will I lose in the switch from the 3" Cobrasticks to the 3" Cobrapacs? In your opinion, do you think the merge collectors are worth the trouble? If so, how much gain do you think they'll actually provide? Figure a tad over 600 horsepower capability as a base line.

Dave

[RonNichols]

Originally Posted by undy

Rare,

I'm thinking of of dumping my 4" non-packed setup I have and getting rid of the 4" collectors too. I'm thinking about a set your 3" Cobrapacks with a nice set of Kooks or Dynatech 2" primary by 3" outlet true merge collecters. I've got a couple questions about the swap, if you will. How much horsepower will I lose in the switch from the 3" Cobrasticks to the 3" Cobrapacs? In your opinion, do you think the merge collectors are worth the trouble? If so, how much gain do you think they'll actually provide? Figure a tad over 600 horsepower capability as a base line.

Dave

Dave,

Not that you're asking me, but I'll interject anyways. For the money, you can't beat the cost of the Megs' merge collector kit from Cone Engineering. I wondered how to get a slip on merge collector to work, and experimenting with a $300+ each collector not knowing if it would look or work well made me sick to even think about trying it. The megs venturi merge collector kit was less than a 1/3 of the cost and came out looking, in my mind, better than a Dynatech or Kooks. You can trim the divergent side of the collector to butt weld smoothly to the cobra pack muffler, or transition it internally.



Ronnie

[undy]

Originally Posted by RonNichols

Dave,

Not that you're asking me, but I'll interject anyways. For the money, you can't beat the cost of the Megs' merge collector kit from Cone Engineering. I wondered how to get a slip on merge collector to work, and experimenting with a $300+ each collector not knowing if it would look or work well made me sick to even think about trying it. The megs venturi merge collector kit was less than a 1/3 of the cost and came out looking, in my mind, better than a Dynatech or Kooks. You can trim the divergent side of the collector to butt weld smoothly to the cobra pack muffler, or transition it internally.


Ronnie

Thanks Ronnie, that's a sweet setup. I need to see who I know that has a tig welder. Paying a pro shop can lead to a lot of $$ for all that detail. I have a gas mig welder myself but it'll be like doing brain surgery with a Bowie knive. I don't weld enough to make it pretty anyway. Also, with my existing 4" collector I'll have to see if I could pull the primary bundle together tight enough to fit in the new collector. A couple large hose clamps around the primary tube bundle might pull it together. Cone Engineering has some pretty good instructions on their web site too. A little investigation is in order. Thanx for the info..

Dave

[Rare Iron]

Undy, you won't lose any more flow by going to the 3" packed Cobrapacks vs. the inserts I built for you, & you will quiet the exhaust down a lot. Like Ron & I stress, just make the transition into the muffler flowpath smooth & easy. You don't want to hit any "walls" which will cause a LOT of turbulence at the inlet of the mufflers. I've not had ANY negative feedback on the Cobrapacks since I introduced them to my line, & there's a bunch of Cobra owners using them now - probably over 100 cars running them.

[undy]

I just ordered a set of Rare's 26" packed 3" Cobrapacks to replace my 4" setup. Per RonNichols' suggestion, I'll order a set of Cone Engineering's merge collectors for the install too. I'll do the merge collectors' internal assembly myself per their instructions with my Mig machine. I'll tack weld everthing together to get the muffler angles etc right and then have everything Tig welded together by a professional.

Dave

[sparks]

Any one know of someone who could make me something similar? I could send my pipes out and have the muffler replaced and recoated??

[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

[Dwight]

old thread but I'll update my post from 08.

Lainhart stops the shows when he drives up. Sounds just like a Cobra should.
That 487 thumps. The ground shakes. I love it. Everybody loves it.

Mine, quiet at cruise speed but mak'in more ponies.
My 354 is putting 402 to the rear wheel. I belive the Classic pipe help to make that kind of horsepower.

I install a pair of Classic's on Hodge's Cobra last fall. He has a KC 408 stroker, 525 hp.

Quiet at low rpms but when you push the go pedal, your gone and they hear you. Quiet enough at cruise speed that you can easily talk. Best of everything.

I think when you go with a longer side pipe, it's quieter. When you go with the larger inside diameter you gain hp and it is louder.
I recommend the longest pipe you can put on it with the 3" I.D.

Dwight

[Rare Iron]

Originally Posted by 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

Lou, it does not make a big difference turning the louvers one way vs. the other in flow. Going OVER the louvers (with the grain) is about 4 dBA's louder. I recommend going against the grain & INTO the louvers. None of the Cobra guys have used the 3.5" OD chambered Powersticks with the crimps in the outer body! They look different (they look very "industrial") & they sound MEAN! Much more mean than with the smooth 4" body. The crimps in the outer body create sound wave anomalies that really TUNE the exhaust note.