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Discussion Starter · #1 ·
I installed the 50 series delta flow on my 69 w/396. Due to budgetary reasons, I retained the pipes that were on the car (2¼ primary, 2" tail). The previous mufflers were a middle of the road turbo muffler nothing too special and not very loud, although likely a bit louder that OE.

The FM mufflers are much more quiet than I anticipated at idle. I could sneak it into the garage at night without the neighbours knowing (darn it
). It does open up nicely under heavy throttle though. I definitley noticed an improvement in upper-end pull though, pulls harder. Overall I am happy with the FMs and I thought I let you all know.

Question: Will the sound note change substantially (louder/softer?) when I upgrade to 2½" pipe (front to back) in the spring? I have heard an H pipe will quiet the exhaust a bit, but I am not sure about the pipe size change. TIA.

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Ron Cook TC Gold Member #1276
1969 300 Deluxe HTSS396 69 300 Deluxe 325HP L35 69memorylane 1971 Malibu 2DR HT
"Supporting all car hobbyists, even those with different cars, is what being a true enthusiast is all about."
 

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With a big block liike yours, you could benefit performance-wise from going to 2 1/2 pipe all the way back. Just not sure how you'll adapt the 2 1/4 inlet and outlet on the FM to the larger pipe. I suspect that it will be marginally louder, but can guarantee it will be deeper.
I've got 2 1/2 all the way back and through 50 series Flows with an H pipe, all behind a big block. Not particularly loud at idle, although it does command attention - sounds absolutely ominous. Nail it, though and things get loud in a hurry.


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Phil
"I don't believe I'da told that"
 

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Ron,I run the 50 series on my 4 speed car,and with headers,2.5" lead pipes/2.25" tails,it's fairly loud(no sneaking into the garage with this one)but my motor has about 10.5 to 1 comp,along with an LS6 cam.Flip side,my 70 SS454 (auto) has a stock big block,low compression/stock cam and exhaust manifolds.Now,that car has 50 series as well(with stock pipes),and it's too quiet..just a little comparison for you,hope it helps.

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1970 Chevelle SS396/M21/4.10 My 70 SS396
Engine pic
1970 Chevelle SS454My 70 SS454
1968 Oldsmobile Cutlass convertible
1982 Oldsmobile Cutlass 350 Olds,TH350(daily driver)
Chris Corwel,TC Member 785
 

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Discussion Starter · #4 ·
Thanks guys.
Uncle (Phil): What I did knowing that I plan to upgrade pipes: I bought mufflers with 2½" ports and had adapters made to fit my pipes. So, no fuss when I upgrade. I think the 2" tails are what might be killing the sound - I am told that its 10¼:1, but it does have a pretty mild cam too.
Ron
 

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I have the 40-series flowmasters with 2 1/2" pipe. The tailpipes turn down in front of the rearend. All I can say is this thing is LOUD. When I have it idleing in the driveway, it shakes things in the house. It has a really deep rumble. I don't know how much louder the 40-series is than the 50-series, but I would bet going to the 2 1/2" would make yours louder.

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Mark "THE DUDE" Skoch
1971 Malibu
"If you ever reach total enlightenment while drinking beer, I bet it makes beer shoot out your nose."
THE DUDEMOBILE
 

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Good to hear you got the Flows on Ron. Good thinking about your current setup for upgrade next year.

Gee, we may be in for an exhaust "rumble" competition this weekend in Oshawa




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ACES #4241, TC #947
69 SS Sedan
 

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Ron,
How loud and how "good" an exhaust system sounds is a very individual and subjective topic. I replaced the stock exhaust system on my mildly built 396 in stages. First step was FM 50 series mufflers and 2.5" tail pipes. Noticible improvement in performance, but the consensus was this was too loud. Step 2 was to replace the exhaust pipes with new 2.5" pipes and add an "X" crossover. This really changed the sound and made another noticible performance improvement. It was quieter, pulled better at all RPMs, and sounded like a V-12 Maserati. However, it was still too loud for my/our tastes. Last step was Monza resonator tips which lowered the pitch/tone and added sufficient "quiet" to make for pleasant highway cruising. This setup sounds awesome when you put your foot in it and it really turns heads. I get dozens of thumbs up and "Hey, what you got in that thing?" questions. I, of course just HATE this
but I tolerate it.

Note that this is on an Elky with tall highway gears and the stock exhaust exit location behind the rear wheels. If your pipes exit out the back and you have numerically higher rear gears, those would affect your results too. I really like the way my setup sounds.

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Mike Ahlmann
'69 Elky SS-396
Sunnyvale, CA
There are no atheists at 150 MPH!
 

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Discussion Starter · #8 ·
Mr 4 speed and Mahlman:

You guys are both running 50 series mufflers - Are these 50 series Delta Flow Mufflers?? I was told that the original 50 series (what I really wanted) were discontinued, replaced by the 50 delta flows. My parts guy siad that the DFs are just a touch quieter, but hardly different at all. I suspect that there may be a bigger difference after all if you guys are running non DFs. Please let me know.

Don: You better practice up pal!


Ron
 

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I heard the same thing about the Delta Flows when I bought my mufflers. I talked to the local muffler shop and he said that he was having trouble getting the original Flows. His suppliers kept sending him the DF's eventhough he was requesting the originals. He thought the originals had been discontinued. I wanted the original flows for my car so he suggested I get them from Summit. I ordered them and got the originals with no problem. I have heard that the DF's dont sound as deep as the originals.

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Mark "THE DUDE" Skoch
1971 Malibu
"If you ever reach total enlightenment while drinking beer, I bet it makes beer shoot out your nose."
THE DUDEMOBILE
 

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Mine are the non-DF's. My understanding was the the DF's were designed to flow a hair better and drop the resonance inside the car's interior.
Mike's right that what sounds good to one may sound nasty to another. Also, EXACTLY how your engine is configured will make a big difference. Ours is a mid 400's c.i. displacement with a big (but not huge) cam and around 9.75 comp. ratio and headers. The Flows and H-pipe made a very noticable difference in the way the car pulled - seemed to really improve torque and clean up the pull through midrange. I've heard SB's running 11.5 cr that were a good bit louder through the same mufflers, but not as deep.

BTW, slick solution to setting up to upgrade
That's the way to think ahead!!

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Phil
"I don't believe I'da told that"
 

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Ron
Good to hear you got the Flows on,and it was a good idea to get the 2 1/2s. I know you told me the Flowmaster pipe kit(2 1/2 dia.) was very expensive there,but you planned to update to the bigger pipes in the future.I installed this kit on my 70 with the 2 1/2 inch pipes including the "H" pipe and it is louder than the 2" tailpipes that I had on the car before. The Delta flows do not cause resonance inside the car, but outside it has a deep rumble at idle and when you get on the gas. I took it last night to the cruise night and everyone noticed the difference and louder sound. My son has 40 series on his car and he cannot sneak into the neighborhood nevermind the garage.
 

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How much is the going price for FW 40-50 installed w/dual tailpipes on a '70 Chevelle?My engine is about to be installed so its time to look into exhaust systems.

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Myles Turner, the "odometer rollback specialist"

"The difference between Men and Boys are the price of their toys"

1970 SS 396 TH400
 

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I just got a new Flowmasters with 2 1/2 head and tailpipes and 3" tips. Lemme tell you its not quiet. I couldn't sneak up on a rock concert, but inside its not all that bad. It has a nice crackle at idle, a mellow deep tune at easy acceleration and a loud rappity sound at WOT. I have the tailpipes exiting under the licence plate and its actually quieter in cab than my previous 2 1/4 pipes with turbo mufflers. It is however illegal. i was talking to a cop and he said that with my setup the noise is acceptable if i keep the revs below 2400, but if i go over 2500 they really start getting too loud. Fortunatly i have 2.73 rear gears and 70 is right at 2450. It all depends on gear ratio, tailpipe exit point and how heavy your foot is.
 

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Discussion Starter · #16 ·
I just got back from the Oshawa Show with all the TCers who went, including Shai (Chaos Malibu!)
Thanks for all the reponses everyone!

I didn't want mufflers that were deaffening, but I did want a little rumble at idle...I hope the upgrade to the 2½" pipes will help the sound somewhat. Having just got off the road on a 3 hour drive {averaging 70mph) I suppose I could be thankful that the mufflers aren't any louder
But, if the pipe upgrade next year when I have more cash doesn't help, I'll have to seek out different mufflers.

Framer, It is 3.07 pegleg, and already a 12 bolt
Yeah someday, that is an expensive upgrade. Maybe when the student loans are done


[This message has been edited by Bow_Tied (edited 08-26-2001).]
 

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Dear B. Tide....Don't forget, there could always be somebody out there who would want that rear gear, for whatever personal reasons. Good luck finding him.

R.B. Maxx ( Silverthunder )
 

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I just got a new Flowmasters with 2 1/2 head and tailpipes and 3" tips. Lemme tell you its not quiet. I couldn't sneak up on a rock concert, but inside its not all that bad. It has a nice crackle at idle, a mellow deep tune at easy acceleration and a loud rappity sound at WOT. I have the tailpipes exiting under the licence plate and its actually quieter in cab than my previous 2 1/4 pipes with turbo mufflers. It is however illegal. i was talking to a cop and he said that with my setup the noise is acceptable if i keep the revs below 2400, but if i go over 2500 they really start getting too loud. Fortunatly i have 2.73 rear gears and 70 is right at 2450. It all depends on gear ratio, tailpipe exit point and how heavy your foot is.

I thought the lower the gear ratio (the taller the gear) such as your 2.73, the lower the rpm?? Because I went from a 3:73 to a 3:42 and the rpm went down...

Ron


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1989 Chevy Suburban/454tbi/2500/4x2/3:42;G80/F&R a-c/K&N air filter/180* Thermo Stat/10city;13 highway
 

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Discussion Starter · #19 ·
rb: I hear the only guy in London that wants those gears has a 69 Beaumont - I try to avoid him


River Bum: Are you sure you have a 50 series muffler? describes a bit like a 2 chamber - Is it a delta flow?
Ron
 
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