Flowmaster/Walker comparison--and a question...

[Kodiak]

Well, I’ve finally settled to my satisfaction the Flowmaster question: a 3-chamber WILL create backpressure and interior resonance. I just replaced the one on my truck with a Walker and a Dynomax bullet for a resonator; EGTs are @ 100 degrees lower in all apps, and the boost reaction is downright frisky. ‘Nuf said.

I do have a question, though. Even though the interior resonance is down from that of the Flowmaster, I’ve still got enough at 2000 rpm cruise to be tiring after a few hours. Do any of you think that it would be less with a 4” turbo-back? My engine is rock-stock, and I’m wondering if I’d be wasting my money on the upgrade.

Thanks for the help...

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'95 2500 CC, SLT, LB 2WD, auto 3. 54, 74,000--Westech gauges in Autometer pod, Prime-loc, Brite box, Back-off Box, White Night back-up light module, Line X, Walker muffler, Borgeson steering shaft, Geno's Crankcase Breather/Vent Tube Catch-All

 

[Cooker]

IF you are looking for any performance gain with the 4" turbo to tail, you won't find it with a stock motor. It may sound a little better though, but I'm not sure it will eliminate your problem.

What I seen done is to install a 12" piece of flex pipe at the bottom of the factory downpipe. You will need to cut out an 6" section on the down pipe and slip the flex pipe on and use lapping band clamps and all should be ok. I think it'll cost about $30. I've heard it works, so for $30 it may be worth a shot.

Check your email I forwarded you an email I got from a TDR member who did this.

-Ryan

 

[Forrest]

I'm 4" turbo to tail & I get the ~2k resonance. There have been some ideas though, like attaching 1 or 2 more hangars on the long sections, or tacking on a length of angle iron on the straight section. One of the local shops said to put another shorty 4" straight thru in that long section & it'll get rid of it.

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Money Sink - 96, 5 speed, TST 380, HX40-16, 300 HP Injectors, Scourge BD 4200rpm Governor kit, McLeod, 4", CATless, straight out back, chrome turn down, ISSPRO Pillar, Delvac 1 & Amsiol, K&N, Mag-Hytec, 3:54, Michelin 235s on Alcoas, Rancho 9000's, Valentine One, Garmin.
Dutchmen 27' 5th Wheel.
GoldWing.

 

[Bad340fish]

I have the flowmaster 3 chamber and have NO resonence whatsoever. I just pulled in the driveway from an 890mile trip with 3 other people in the cab. Ran around 2700-2800RPM the whole trip and its quite. If I did not tell someone it had a muffler they would never guess it. I find it odd that you got a resonence in your truck. I am thinking of going to a straight thru muffler just to get some noise out of my truck lol. Keep us posted

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Clark
1999 2500 QC SB 5spd, EZ, Flowmaster 3 chamber, K&N Re-0880
1968 Barracuda Formula S Viper Blue 11. 98@112 Currently scattered all over the garage

 

[tobaccogrower]

guys:
i have a JRE 4 inch turbo back and lost the muffler last night. it was loud before, but now,it sounds like a peterbuilt at wot. . i had to tow a friends full size blazer up a nice steep road last night an if anyone was sleeping before i drove by, they wern't after!!love it... ... james... .

 

[Mopar-muscle]

cooker , i disagree on the 4" not doing anything for a stock motor , i picked up almost 2 mph switching (done at the dragstrip on the same day in 45 minutes) from complete stock system to JRE 4" with a dynomax race magnum welded muffler , not the bullet , sound is good , no drone , but my system is not connected hard persay between the downpipe and the long section , the 2 pipes butt together and are held with a band clamp , makes trans removal easier with the downpipe out .

 

[Kodiak]

Has anyone heard of the Walker 22572? It's the muffler part of a kit made by Walker sold by Delray Muffler House. It attaches to the existing stock downpipe and runs from there to the tail. The muffler is described as larger than the (21471?) 4" Walker muffler that has been discussed here. The kit comes with hangers and clamps and sells for $190.

If I could somehow find a 4" downpipe for a reasonable price, I'd have a 4" turbo-to-tail for a good price. Even without the downpipe, it could be an improvement over stock pipe with a 3" Walker like I have now.

What do ya'll think of this idea?

 

[Cooker]

Mopar-muscle,
Maybe I should put it differently. I think it will do very little for a free flowing 3" exhaust. There is no doubt the stock muffler is restrictive and the CAT is definitely a problem, if equipped, but the 3" pipe is ok up to about 350hp. Sorry. On another note, how do you like the Dynomax Race Magnum Welded Muffler. I have one waiting to go on my truck because I don't think I wanted the harshness of a straight pipe, but still wanted an agressive tone. Does it fit the bill?

Kodiak,
The Walker 22572 is the muffler that comes with the JRE system. The kit you are speaking of is relatively new and for $190 it's a steal. Other prices I've seen around $250 for the kit. I don't think you will see much of an improvement versus your 3" with a free flowing Walker muffler, unless you go with the 4" downpipe. And like I mentioned above the gains from a 4" turbo to tail vs a free flowing 3" are not very noticable until higher horsepower. IMO if you are less than 300hp stick with what you have.

-Ryan

 

[Kodiak]

Cooker,

Thanks for clearing up the 22572. I'm still thinking...

My main concern right now is not power, but resonance. From what I gather, this will not be improved either from going to 4".

Just in case, though... do you know where I can get a 4" downpipe by itself? Add that to the Walker kit... could be a pretty cost-effective way to go 4"!

Also, from what you say, this price is good; John at Muffler House is looking for a good price for a 4" downpipe for this kit. If any of you want to contact him, he's at 800-276-6399.

[This message has been edited by Kodiak (edited 05-21-2001). ]

 

[Kodiak]

Anybody know what the difference is between the Walker 21471-4" and the Walker 22572-4"?

 

[Cooker]

Kodiak,

The 21471 is a perforated tube straight through. You can see right through the unit. The 22572 is perforated also, but the perforated tube does not connect all the way through the muffler like the 21471. It is my opinion that the 21471 will flow better, but be a bit louder than the 22572.

-Ryan

 

[Bad340fish]

Might try looking here http://www.racemufflers.com they have some good gasser products. There is no reason for them not to work good on a diesel. I am going to try one as soon as i get my car going. I need to quit spending money on this diesel or my car will never get done lol
Clark

 

[jmeehan]

Have you tried Stan's Headers for a down pipe? I know they price them seperately on their web site.

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ex Ford tech, now driving Patriot Blue '01. 5 2500 4X4 QC LB ETH/DEE SLT 3. 54. Muffler, silencer ring & door badges N/A.

 

[Kodiak]

Forrest, Cooker, Bad340fish, 85CJ: thanks for all your replies! I've gotten a wealth of info from you guys and hope to get this solved right away. I'll post any successes or failures I have. Thanks again!

 

[C Schomer]

I used the 21471 and shortened the system enough to be able to come out ahead of the rear wheel - I didn't want to take a lot of time to find a 4" 'over the axle' tailpipe. It's considerably louder than the Banks muffler I had but can still talk and hear the radio fine in the cab. I can sure hear the rumble bouncing off of anything I pass! There's no resonance - maybe because I don't have a long, straight length of pipe anymore. When a step on it and the boost comes up, the rumble turns into a cyclone sound but some of that is the turbo noise from the air filter. Walker said this one is the freest flowing of all of theirs! Craig

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97 3/4Ton, 2WD, 5SP, #11 Plate, AFC kit, 14 Housing, AF942M Air filter, Straight Thru Cat, 4"From Turbo, Airlift, Shortened Frame, Custom Bed, 24CKFS Sunnybrook, HEY FORDBOY POWERSTROKE THIS!

 

[Kodiak]

WestTN,

Yeah, I'm beginning to think the exit has a lot to do with it. I've noticed that a lot of the resonance sounds like it's coming from the very back of the truck. Of course, that could just be a trick of acoustics, but I'm wondering if an tailpipe pointed straight out would make an improvement... the sound wouldn't be slamming into all those right-angle turns!

 

[WestTN]

You didn't mention how your exhaust exits. My 1st gen truck has a side exit system of my own design. I first had the turn down tip straight down, but couldn't stand that much racket. It bounced back from the pavement and was REALLY loud! I turned the exit toward the rear as much as possible and it more than cut the noise in half.

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Dennis McCormick

2001 Sport SLT+ 2500HD QC Long Bed 2WD, ETH/DEE, 3. 54LSD, White with Camel interior, Camper Special Group, Rear Sliding Window, custom ordered with ALL the goodies and priced at invoice! Stock for now. 370 miles

1989 D350 SRW Std Cab 2WD 5 speed, 3. 54 open differential, custom exhaust (mine), pump tweaks (me again), Banks aftercooler, 23 psi boost. 220,128 miles and counting. Faster than it’s new cousin!

 

[fest3er]

I recently installed the JRE 4" turbo-back exhaust on my CC, long bed 2500. The tail pipe exits at an angle behind the rear wheel. I've got a loud resonance around 2200-2400 RPM under load. But since I'm almost never running in that RPM range, it's tolerable.

Under full throttle in a small-ish space, it can get *very* loud. Driving up VA311 through the 16' corrugated pipe railroad underpass, I thought I'd stomp on the go pedal with the windows open. I wasn't expecting it to be *that* loud! But under normal, easy acceleration, the exhaust has a pleasant, dump-truck-like sound.

As to power, I *think* the JRE exhaust helped some. Heading west on I64 in WV, there is a long 7% grade. Stock, I couldn't hold 60 MPH in OD. With 215 HP injectors, the truck held 72 MPH nicely. With the JRE on there, it held 75 MPH, with a little pedal to spare. Of course, that works out to a 4% increase, which is entirely too close to the 4% increase one sees with Amsoil lubes. And I should be on non-blended fuel now. Finally, one sample is statistically insignificant. If nothing else, the JRE exhaust *sounds* more manly.

Fest3er

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Neal P. Murphy; Amsoil dealer
'98 auto, 4X4, valve- and BOMB-challenged; Yokohama 225/75-19. 5 on Rickson wheels; 67K miles; Amsoil dual remote filter

 

[Kodiak]

fest3r,

[Toolman voice sounds here... ] ... and that's the whole point of the exercise... great chest-rattlin', gut stirrin', deeeeep sound!!

I am beginning to think that the 4" system puts out a lower frequency set of sounds than does the 3" that I have--there's a bit of mid-range honk in the 3" trumpet. The resonance is still there with a 4", but perhaps in a lower frequency--which ultimately is more likable!

After reading all the posts about it, I think this resonance is there no matter what efforts are made to get rid of it. It's just the sound of the Cummins flexing!!