I know most of you want LOUD, LOUD , LOUD, But I dont want to attrack more attention that I have to. Im putting a zz430 in a 89 and i want a catback thats dosent scream when you get on it. Im looking for a nice low tone. I will have headers and no convertor.

 

I have heard that Dynomax makes a nice, quiet, and powerful cat-back. It's one of the cheaper ones out there, and i'm going to get it ASAP, but am putting an 80 series Flowmaster for noise. I've also heard that the Super Turbo muffler that is included flows better than the Flowmaster. I think it comes with all the clamps and hangers too.

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--Steve S-- 84 Trans Am 305 HO 5 speed, completely stock will soup up when i get some $$$$$$$$$$

 

The Dynomax system is very quiet at idle - can hardly tell it from stock, and they are reputedly among the best flowing mufflers available.

Pete

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Pete's Place
HiOutput <a href="http://www.hioutput.com/rpmworld.html">Virtual Racing Team</a>

<IMG SRC="http://www.hioutput.com/pics/SC.gif" TITLE="Pete's 83 SC">
My 83 SC...(originally V6) 203,400 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, custom air induction .....best ET is 14.935@94.14</P>

 

Soundwise what is the difference between the dynomax and the Borla. Im not using a Cat Convertor. I want the low low purr.

 

For what it's worth, I just got my Dynomax Cat-back for Christmas, and man, it is sweet. It's quiet(just spent $1000 on stereo crap, and I would like to hear IT, not the car) and it packs a lot of power behind it. I have a 305 TBI, and the cat-back alone just added some serious power. Next for me is headers, intake, and gears. But I might have to rob a bank or something first, I'm broke as a joke. Hope this helps, I would recommend the Dynomax to anyone out there. It only costs $150 also, which is another plus.

Dave
92 Camaro RS
305 TBI
Upgraded sound system
K&N Filtercharger
Dynomax cat-back

 

Whats included in the dynomax catback kit? tips, muffler? hangers? where is the best place to get it?

 

I don't know about the whole cat back, since I had amuffler shop remove all the factory exhaust besides the y pipe and bend a new one, but I do have the Dynomax muffler. like everyone else said its quiet and adds a some noticable power. Jegs is probably the best place to get it.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
http://www.bassettracing.cz28.com

 

and it has Mandrel bent tips too,

whoa i never used that UBB code before

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--Steve S-- 84 Trans Am 305 HO 5 speed, completely stock will soup up when i get some $$$$$$$$$$

 

Is the dynomax 3 inch Ive gotta have 3 inch

 

the dynomax cat back reduces into 2.5 right before the muffler. I have the flowmaster force II system on my car, and it was actually very quiet before I put the engine in my sig in it. Not it is loud but not incredibly annoying.

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Black 89 IROC...Mods: 355, 10.5:1 comp, Big Solid Crower Cam, TFS heads, Victor Jr, Holley, and a 5 spd...

 

edelbrock systems arent all that much louder than stock

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-Stock Tbi 305 with a lot of damn miles
-Edelbrock Z28 TES Headers
-3 inch Catco High Flow Cat
-3 inch Edelbrock Catback
-SSM Subframe Connectors

Stereo
-Pioneer DEH-P4100 cd player
-Polk Dx9 6x9s

 

I don't know about on the 305 cars, but on 4th gens, the Edelbrock system is nearly as loud as the American Thunder setup. If you're wanting quiet, first thing I would do is put back on your catalytic converter, or buy a high-flowing one, along with a stocker-type catback. Diameter of pipe isn't so much the issue as it all being the same size, since most of the cat-backs are either 2 1/2" or 3" anyways. I'd go with Flowmaster's Delta flow cat-back, stock flowmaster tips and see how ya like that. It's much quieter than the American Thunder setup, yet supposedly yields more horsepower.



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Dan Young
1995 Z28/M6
Groton, CT

1985 Z28/A4
(Prospective purchase)