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2 chamber muffler choices
#1
I'd like to change the old exhaust system on my 1971 big block 429 CJ. I'm keeping the iron headers (for ground clearance) and prefer the 'dugga dugga' sound of 2 chamber type mufflers rather than turbo's. Guess that means something like flow masters (40 series, super 44, super 40 or delta 40's) or maybe summit racing versions? Will go H pipe as well. Not a daily driver so can be quite loud but not too heavy on drone if possible. I've checked this forum and you tube clips etc but wondered if anyone here has used any of these on a big block and what their thoughts might be? Cheers.
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#2
Back when I liked loud exhaust, I really preferred the sound of duals without the h-pipe / y-pipe. Yea, I know you are supposed to get better HP with them. Tongue

Now I'm all for quiet.

73 ragtop, 1999 Mustang Bright Atlantic Blue Paint, Phoenix Engine 302-335HP,  Edelbrock Carb & Performer manifold; c4 with 2000 stall and shiftkit; 3:55 auburn limited slip differential, Hedman shorties; Car Chemistry Exhaust

Classic Air; Tilt Steering Wheel; 1999 Chrysler Sebring bucket Seats ; power windows;
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#3
I agree, if you're looking for loud exhaust skip the H pipe.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#4
It's more the quality of the sound rather than just the decibels I'm after! I gather that the h-pipe helps give more of an old school muscle car rumble (whereas an x-pipe is more a race type roar?) as well as maximising torque so that's definitely my preference. I'll also keep to a 21/4" diameter pipe (rather than increase to 2.5") as I don't plan to go too mad on engine tweeks.
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#5
(05-15-2019, 03:11 AM)mustangandy Wrote: It's more the quality of the sound rather than just the decibels I'm after! I gather that the h-pipe helps give more of an old school muscle car rumble (whereas an x-pipe is more a race type roar?) as well as maximising torque so that's definitely my preference. I'll also keep to a 21/4" diameter pipe (rather than increase to 2.5") as I don't plan to go too mad on engine tweeks.

Has to be a real trade-off. I had Flowmaster 40's on my car and loved to sound - but just couldn't live with the drone and found that nothing could be done about. They would be OK if you just drive the car occasionally and not much on the highway. I use my car as a daily driver and switched to turbos which still have a little rumble but no drone.
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#6
I just added Flowmaster FX mufflers to the 71 I did. It sounds good without any drone when driving.  

<iframe width="560" height="315" src="https://www.youtube.com/embed/xFQQN--nU4w" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Kevin

1971 Mach 1
408C Stroker
C4 w/3,000 stall
8.8" Rear w/3.73's
Disc brakes all way around.

[Image: 28ivsix.png]




                                                                                             
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#7
Hooker Aero Chamber mufflers may be an option. I ran them once, a long time ago, and liked them. Chuck
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#8
(05-15-2019, 10:24 AM)c9zx Wrote: Hooker Aero Chamber mufflers may be an option. I ran them once, a long time ago, and liked them. Chuck

One of my favorites. Has that deep rumble without the rappy tinny sound of a Flowmaster.


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#9
Everyone has a right to their likes and dis-likes in exhaust sound. Having said that, mine is that a divorced (no cross over of any kind) dual exhaust system sounds much like passing gas in the bathtub only louder and more annoying. The H pipe gives more bass than the X pipe. The difference in power is negligible. Chuck
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#10
Couldn't agree more, Chuck. thumb

I have Pypes Street Pros on mine (came with a Pypes 2.5" exhaust w/X-pipe).  It sounds cool at idle with no drone at speed - mine has more of a 'dugida, dugida, dugida' sound though.

I've also heard Magnaflows are great pass-thru mufflers with no drone as well.

All of that aside, I think a large part of the 'duga, duga, duga' sound has a lot more to do with cam choice than mufflers (and exhaust system style).  The more aggressive the cam, the more 'dugida, dugida, dugida' sound will come through (as greater cam lobe separation tends to space things out a bit).

Eric

[Image: mach1sig2.gif]
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