Walker Quiet-flow SS install

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Re: Walker Quiet-flow SS install

Postby woody90gtz » Fri Feb 14, 2014 11:44 am

That's why I'm looking to replace it. It might be fine with the over 4.0L version, but I'm not about to go down that route again.


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Re: Walker Quiet-flow SS install

Postby weba » Sat Feb 15, 2014 7:13 am

Both my cars are super-loud, I could really use one of these more silent mufflers :D But without losing the V6 sound that is quite rare up here.



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Re: Walker Quiet-flow SS install

Postby RobertISaar » Sat Feb 15, 2014 1:02 pm

..... it's a glasspack with a flow-actuated butterfly valve in a chambered muffler case. that would be why it will do the cackle on decel/overrun.

i like the cackle, so i've never tried to get rid of it on mine, but i don't know if it is possible to do using only a glasspack-style muffler. i think you would need to have a chambered muffler(which will have a dramatic effect on tone at all times) or perhaps a helmholtz resonator(which shouldn't have the same problem, IIRC).



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Re: Walker Quiet-flow SS install

Postby oldtimer88 » Sat Feb 15, 2014 3:02 pm

woody90gtz wrote:Yeah. And for the most part it works...only in certain circumstances does it flutter. Dynomax recommends one muffler for under 4.0L or dual exhaust, and a different for over 4.0L and single exhaust. I'm thinking the 3.4 with headers and 2.5 pipe may just breathe too well for the "under 4.0" version that I have.

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The dynomax mufflers are good and fairly cheap... I have them on my chevelle with true dual exhaust... it has a nice mellow tone but not too loud on the road.....



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Re: Walker Quiet-flow SS install

Postby woody90gtz » Sun Feb 16, 2014 10:45 pm

I had a straight through Borla XR1 glasspack-style and that thing was crazy loud. It really didn't cackle at all with my auto, but the headers and 5spd made it do it a lot.


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Re: Walker Quiet-flow SS install

Postby 3X00-Modified » Mon Feb 17, 2014 8:53 am

I still think as most say online the "cackle" is caused by your decel enrichment tuning you have or don't have for that matter. My Legacy goes into immediate injector shut off as soon as your coasting and that has no cackle at all, similarly with the Beretta, but that is also an auto so it's sometime will coast and rpm's will drop down and not engine brake. Other times that it does engine brake you can hear the cackle... But with the cam setup I have now it's different than before.

I miss the sound of this muffler...

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Re: Walker Quiet-flow SS install

Postby 99GaGT3X00 » Mon Feb 17, 2014 5:45 pm

woody90gtz wrote:I had a straight through Borla XR1 glasspack-style and that thing was crazy loud.

and who got pulled over that weekend.. :lol:


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Re: Walker Quiet-flow SS install

Postby woody90gtz » Mon Feb 17, 2014 8:00 pm

What setup was that Jon? I like the v6 burble but not the fart crackle & pop. Was that in L letting the engine brake?

Mine have deceleration enleanment and deceleration fuel cut off. I turned it off with my truck to try it out and I still get the crackle.

99GaGT3X00 wrote:
woody90gtz wrote:I had a straight through Borla XR1 glasspack-style and that thing was crazy loud.

and who got pulled over that weekend.. :lol:

At least they were cool and let us go once they figured out we weren't drug dealers...


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Re: Walker Quiet-flow SS install

Postby 3X00-Modified » Tue Feb 18, 2014 8:59 am

LOL that was a funny police stop.

That was the Camaro 80 Series Flowmaster and yeah it was in L engine braking...

I would think with the Decel fuel cut shut off it would crackle more, All I know is in the subie my wideband will read AIR as soon as I let off the gas and start decel.



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Re: Walker Quiet-flow SS install

Postby woody90gtz » Tue Feb 18, 2014 9:56 am

"Air" as in no fuel at all? Mine pegs lean which would be the same thing.

Mine crackles in DFCO and in the couple seconds leading up to it. I turned it off just to see what would happen and there was no change. Part of that problem with my truck is likely the wet intake...when closing the throttle the vacuum sucks all the fuel off the runner walls and it actually swings rich before it goes lean on decel.


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Re: Walker Quiet-flow SS install

Postby 99GaGT3X00 » Thu Feb 20, 2014 5:25 pm

woody90gtz wrote:
At least they were cool and let us go once they figured out we weren't drug dealers...

:lol: and i was the only one who got "busted" probably ran my plates and saw that wasn't the first time i had been stopped for it..

it was funny when they told us it was a shady motel.


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3400/3500 Hybrid
227/233@.050 .515.515 lift 112LSA
15.232@88.85mph on stock 3400

99 Grand Am GT------03 Subaru Outback H6

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Re: Walker Quiet-flow SS install

Postby Godlike » Thu Feb 20, 2014 8:10 pm

I would have been more likely to try the Dynomax vt if it was tunable. Either a trap door to let you change spring rate or an external screw adjustment would have been cool.


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Re: Walker Quiet-flow SS install

Postby davbell25413 » Thu Feb 20, 2014 9:53 pm

Nice exhaust setup you have there.


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Re: Walker Quiet-flow SS install

Postby woody90gtz » Wed Apr 23, 2014 8:02 am

Brad I can't tell from this pic, but is the muffler narrow enough to clear the shock, or is the case just short enough that you have pipe next to the shock and the muffler after? My HUGE Quietflow didn't quite fit. And did it neck down inside to like 2" or less on that perforated pipe inside? Makes me wonder what it actually flows.


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Re: Walker Quiet-flow SS install

Postby Godlike » Mon May 05, 2014 6:33 pm

The case is short enough that it fits behind the shock by about 3". And I don't recall if it necks down on the inside or not. To be honest I was far more concerned with decibels than hp on this car although it seams like it outflows stock substantially.
I would say it easily flows more than enough for my stock 3400. The exhaust just rolls off the tips and drifts straight up at idle unlike my high strung Quad which shoots smoke rings in the winter.


90' GTZ 189whp NA 14.00@99 / 237whp 50 shot 13.3@104 /95' Integra 225whp / 69' Impala / 04' Z71 Tahoe/ 85 K20/ 15' IS350F
projects 86 Bonneville 6.0 swap / MkIII Supra LS1 swap


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