[Shawn]

Has anybody used Dynomax SuperTurbo mufflers on their car? I've got a 69 with a 406SB, Hooker Supercomp headers, and a 3" flowmaster system all the way back. (For sale....cheap!) I'm going to ditch the 3" system and go with a 2.5" setup. I am looking to get a good street muffler that won't attract undue attention. There's a shop near me that will custom bend a system with Dynomax mufflers and H-pipe for about $290. Anybody have experience with these particular mufflers?

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Shawn Peterson
1969 Z28, 406SB
http://www.geocities.com/corsican69

[SSMark]

Don't know about the Dynomax. Why ditch the 3" ? Noise or performance? I want both low noise & high performance, don't we all.
Thanks,
Mark
PS The price does not sound bad for good metal.

[This message has been edited by SSMark (edited 01-11-2000).]

[gheatly]

I had a muffler shop custom bend my 2.5 inch exhaust for $225, excluding mufflers. The pipes were aluminumized and they still look good 5 years later. Definately have the shop use the aluminum coated pipes or find someone else that will.

Bigger pipes make more noise. If they didn't, all performance cars would come from the factory with 2.5 or 3 inch exhaust systems to gain the extra hp. The OEMs use smaller systems to keep engine noise down.

[This message has been edited by gheatly (edited 01-11-2000).]

[mccorry]

I run Dynomax Super Turbos on my '69. Its a 355ci mildly cammed....

They aren't too loud until you lay into it...then it gets up there....


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Steve McCorry - Central Ohio Camaro Club
'69 Camaro RS/SS-350 - Daytona Yellow
'95 Camaro Z-28 - Sebring Silver

[awsm502]

I too am looking for a new system for my '69 with a 502/502. Did you not like the quality/fit of the flowmaster system, or just the noise? Someone in the Performance section thought the Flowmaster system was the best thing since sliced bread. I have been looking realy hard at the aftermarket chambered systems, but those are only for those who like to attract attention. Personally, I live in a homeowners assotiation, and can't wait to get the hate mail after firing the car up in the garage at 7 am.

Keith - RS/SS 502

[Shawn]

The quality of my 3" Flowmaster system is fine, and I actually love the sound, it's incredible. But... It's not very stealthy, in fact, it's down right loud. I too live in a neighborhood association so I'm dropping it for 2 reasons 1) To make it a little more nieghbor friendly, 2) It draws too much attention from officer friendly where I live.

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Shawn Peterson
1969 Z28, 406SB
http://www.geocities.com/corsican69

[awsm502]

Thanks for the reply, Shawn. What series mufflers did you have, 40's, 50's?

Thanks again,

Keith RS/SS 502

[Shawn]

They're the regular 2 chamber 40 series. No Delta flow or anything, but I heard they make quite a difference.

[Austin]

Shawn is it a 3" system? I contacted flowmaster and they said the largest kit they made for 1st gen. camaro was 2.5"

[cardude]

As far as exhaust size is concerned, bigger is not always better, even with modified engines. There have been many articles out there in the numerous magazines that have tested this and found that performance was increased by using a 2.5" system as opposed to a 3" system. Bill, maybe you could shed some technical light on this subject.

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67 Camaro LS6 454/TH400/12bolt 3.73

[Shawn]

Austin- The mufflers are Flowmaster, the pipes are not. The pipes were custom bent and installed, so the only parts that are Flowmaster are the mufflers themselves.

As for bigger not always better, that is very true. There is an optimal flow rate that maximizes the evacuation of gases from point A to point B. I won't delve into all of the mathematical reasons and fluid dynamics but keep it simple. Smaller pipes will increase flow velocity to a point. There is an optimal condition where flow velocity is maximized while not causing excessive back pressure to the engine. Increased exhaust velocity improves laminar flow and allows the exhaust to move quickly through the tube. The flow velocity is important because it creates a small vacuum to the cylinder between cycles. Since the flow is high, it tends to pull exhaust from the cylinder during the next exhaust stroke. Too large of a diameter can cause the gasses to slow down to the point that it is less efficient, and flow through the pipe is not laminar. If the pipe is excessively large for the engine, the flow will be very slow, and actually make it more difficult for exhaust gases to leave the cylinder. This is the reason large pipes are usually confined to high HP engines where there is a LOT of exhaust flow due to the high RPMs, and therefore keeping the flow velocity high. 2.5" Systems tend to be best for stout 350's and 400's because it is the optimal balance between back pressure and flow velocity.



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Shawn Peterson
1969 Z28, 406SB
http://www.geocities.com/corsican69