IROCThe5.7L

I know he doesn't have his old exhaust setup anymore, but he inspired me-lol






Yes, I polished my cat back (what a loser, hehe). Yes, I realize the muffler is crooked, I need to make a custom hanger on the driver side. Once I'm done, I'll try and get some good sound clips.

1989GTATransAm

iTrader: (3)

That looks like one of those chambered mufflers I have been hearing about. What are those dimples in the muffler? Looks like they might decrease the inside diameter of the pipe.

MrBrooks

Those dimples are the chambers. The flow tube(louvered baffle) is not effected. Best of all there is no packing to blow out of it either.

Reid Fleming

iTrader: (2)

It's gonna be loud.

Demon355

iTrader: (1)

I had my bullet in that position and found that putting into the I-pipe was 10x better. I want me one of those mufflers...

keeslinger31

looks good. Should be loud

IROCThe5.7L

I haven't been able to drive it yet, but I was actually able to slip the muffler on with the car running. It cleans up the sound. Loud, but a good loud with a tone. It doesn't sound like a pickup with no muffler thank god.

I drove around with an open Y pipe for 3 weeks, I liked it, but it was missing a "tone". It was just plain loud.

Orr89RocZ

iTrader: (20)

haha glad to see you going with taht setup. you should like it. I liked mine, but it was in the I pipe so i could retain dual outlets

Last person i recommended that muffler to also liked it. Most cars that have those tubes sound pretty good

IROCThe5.7L

I got a quick little sound clip: http://joenowicki.googlepages.com/MOV03751.mpg


I was thinking about dual outs, but I can get that muffler to tuck nice and high. No one will be able to see it. My 80 series had stock turns downs on it, couldn't see them anyway.

Orr89RocZ

iTrader: (20)

i pipe you lose alittle clearance but its much better than my current 4inch design it hits on most things

i'd do a chambered tube again if they had a 4inch inlet model.

Yours sounds pretty good so far, i bet it sounds better if you stand behind it the camera will pick up the sound better

skinny z

Who makes that chambered tube?
I'd like to look up some flow data.

MrBrooks

http://www.classicchambered.com/
There ya go.

1989GTATransAm

iTrader: (3)

"I'd like to look up some flow data."

I'm with you on the flow data. I did not see any on their web site.

Orr89RocZ

iTrader: (20)

i cant find any data for most mufflers anyway. Its like they rate them on sound and not flow. its like they think exhaust isnt important. I dont see intake manifold flow numbers that often either! two big factors in motor building and they dont give you that information

MrBrooks

Yeah the only mfg i've seen put up REAL flow numbers is PYPES. Even then its not on all sizes or all muffs.

1989GTATransAm

iTrader: (3)

Dynomax does and Magnaflow does on some products. If you have a straight through pipe with preferations such as on the DynoMax or Magnaflow you can probably figure what it is going to flow by the pipe diameter. On the above chambered muffler it looks like it has dimples that stickout out into the exhaust flow. That was the reason for the question.

Orr89RocZ

iTrader: (20)

oh it does, and it will distrupt airflow but that is what gives it the distinct chambered tube sound. Sorta like the old Z/28 cars back in 69. I do believe they had the same mufflers

They will flow a good bit but how much i dont know. Less than a straight peice of pipe i'm sure but better than most flowmasters i'm sure

skinny z

This is as close as I've found to a list of muffler cfm ratings.
I lifted this page from another online forum.


All tests via an independent lab
All tests @ 15” wc

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM


Standard OEM 2 ¼” Inlet/Outlet 138-152 CFM
Standard OEM 2 ½” Inlet/Outlet 161-197 CFM
----------
Remember.
2.2 cfm of muffler flow per horsepower for zero loss due to backpressure.

BMAN90RS

that was me! ya man thats a great system. only reason i dont have it anymore is my pipes rusted at the Y and didnt feel like paying to fabricate a whole new system and then i gotta really good deal on a magnaflow catback. but ya ur gonna LOVE that muffler

IROCThe5.7L

Small update. Found a universal hanger at autozone. Grinded some of it off, heated it, bent it, tapped a hole, and welded it to the tail pipe. Now the muffler sits nice and straight.

1989GTATransAm

iTrader: (3)

Nice work.

Orr89RocZ

iTrader: (20)

yep nice clean install. I just like dual tips that you can see as opposed to single exit tucked under neath

IROCThe5.7L

Sorry, my sister took her camera with her on vacation. No sounds clips until she comes back. But driving it around, it's not obnoxious at all. No louder than the flowmaster (80 series). At least from what I hear inside the car.

Take it over 3000 RPM, and it gets a real nice throaty tone. Couldn't be happier. Over 3k it is louder than the flowmaster by quite a bit.

IROCThe5.7L

Kind of lame. But it was late, it's the best I could do.

http://joenowicki.googlepages.com/B.mpg

Orr89RocZ

iTrader: (20)

sounds good! sounded like mine at idle there!

84z350crate

I like the sound a lot

skinny z

This a fairly decent listing.
Still looking for sound bites though.



http://www.exhaustsoundclips.com/cfm.pdf

IROCThe5.7L

One more:

http://joenowicki.googlepages.com/Z.mpg

resinlake

Have that muffler in the I pipe section, 26/20 3", it sounds very mean, and well, yea getting on the throttle a bit really wakes it up. After letting off there is no crackling sound, just a great pure exhaust tone.