Flowmaster 40 Series VS 50 Series - Chevelle Tech
Headers and Exhaust Discussion related to Exhaust systems and headers.
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post #1 of 12 (permalink) Old Jan 21st, 20, 4:00 PM Thread Starter
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George
 
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Flowmaster 40 Series VS 50 Series

I'm on the fence on which series to use for my 70 Chevelle that will have a 454 with around 500hp.... I'm not sure how loud the 40 series really are compared to the 50s.....

I know a bunch of people complain about how loud the 40s are but are they really that much louder?
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post #2 of 12 (permalink) Old Jan 21st, 20, 4:33 PM
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Jim
 
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Re: Flowmaster 40 Series VS 50 Series

I have them on my '69 with a 350. Never had an issue with the drone that people complain about, but I have dynomat on the entire floor pan and the exhaust exiting under the rear bumper. Not too loud in the car, but certainly noticeable from the rear.

jim
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post #3 of 12 (permalink) Old Jan 21st, 20, 10:07 PM
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Greg.
 
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Re: Flowmaster 40 Series VS 50 Series

I have the 40s on my car plus Headers and the exit like Jim's at the Rear Bumper
just the Factory Jute Backed Carpet

I do not find them to load or droney when just Cruzin
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post #4 of 12 (permalink) Old Jan 22nd, 20, 9:14 AM
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Jeff
 
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Re: Flowmaster 40 Series VS 50 Series

I know this isn't an apples to apples comparison, but hopefully it may help? I actually measured the volume of flowmaster 50 series big block muffler vs magnaflow.

I tried to build a V8 swapped blazer for my daily driver that was emissions legal and somewhat of a sleeper.

It's an LS swapped 5.3L V8, shorty stainless headers, dual 2.5" highflow cats going in to a dual in 2.5" flowmaster big block 50 series, single 3" out, all bent pipe, exhaust exited behind passenger rear tire like stock.

I would recommend the big block mufflers as they're thicker metal so they won't resonant as bad as the normal flowmasters. With the LARGE open cabin of the blazer these still resonated bad, to the point it was vibrating my pant legs at cruising speed. I switched out to the longest muffler magnaflow makes, dual 2.5" in, single 3" out, 28" long case. It was still loud, but much more mellow, didn't resonate, and honestly picked up some top end power because the magnaflow flowed much better than the flowmaster.

Your car will be louder as you probably aren't running cats, larger displacement, and have true duals vs mine merging inside the muffler.

If you click on my screen name in the youtube vid there's other videos of the blazer so you can compare the exhaust more if you like.

flowmaster

magnaflow
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*Jeff*

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post #5 of 12 (permalink) Old Jan 22nd, 20, 9:48 AM
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Tom
 
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Re: Flowmaster 40 Series VS 50 Series

I am running the Flowmaster Delta 40 with my 396. I think it is loud enough to suit me but not enough to warrant a ticket unless I am going WOT. They are at the low end of the 40 series. I don't want anything louder for the street.

Tom
'69 SS396 4-Speed Hardtop Red/Red

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post #6 of 12 (permalink) Old Jan 22nd, 20, 10:08 AM
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Vince
 
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Re: Flowmaster 40 Series VS 50 Series

The 50 deltas were pretty much perfect IMO. Flow master sound without excessive noise and no drone.
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post #7 of 12 (permalink) Old Jan 22nd, 20, 4:09 PM
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Re: Flowmaster 40 Series VS 50 Series

I found the 3 Flowmaster videos here to be quite informative- https://classicmusclecarexhaust.com/i/exhaust-101
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post #8 of 12 (permalink) Old Jan 28th, 20, 12:24 PM
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Dennis
 
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Re: Flowmaster 40 Series VS 50 Series

I have an X pipe, dual 2.5 in/out 50 series and tail pipes all the way to the bumper.
I have a full Dynamat interior, Jute under the carpet, MLV behind the back seat, carpeted trunk and I still get a drone at certain RPMs.
And because its a V6, it still sounds like a V6. So I have the Worst of both worlds??

66 Chevelle hardtop - LFX 3.6 liter V6/6L50 6 speed auto trans, 3.07 10 bolt, full Hotchkis suspension, Wilwood 4 wheel discs, white with red interior, cowl hood.
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post #9 of 12 (permalink) Old Jan 28th, 20, 1:11 PM
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Henry
 
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Re: Flowmaster 40 Series VS 50 Series

Forty (40) Series Flow Masters with full three(3)inch all the way back with an X pipe. Exits out at the rear bumper per stock Chevelle tips.
Noise at cruise allows normal conversation level.
Loud kinda buzzy sound when you put your foot put into it, which I attribute to the X pipe.
Never run open exhaust but happy with strip performance of 10.70's /80's. 125mph
99.9% street cruiser/ fun vehicle.
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post #10 of 12 (permalink) Old Jan 28th, 20, 1:23 PM
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Ken
 
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Re: Flowmaster 40 Series VS 50 Series

On my 70 I had straight duels with Flowmaster 40 series exiting by back bumper. The drone noise inside was so bad we couldn't talk with each other. I now have a H pipe with Flowmaster FX mufflers exiting by the back bumper. No drone noise what so ever now. We can talk, even with the windows down and it still has the roar out back.

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post #11 of 12 (permalink) Old Feb 1st, 20, 12:26 PM
 
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Re: Flowmaster 40 Series VS 50 Series

Ken Hayes,
I know that trying to describe sound is difficult, but what difference in sound quality or tone did you experience between the FX and the 40's?
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post #12 of 12 (permalink) Old Today, 9:57 PM
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Dronemaster for sure, never again.
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