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-   -   Muffler Alternatives (http://www.clubcobra.com/forums/superformance/145616-muffler-alternatives.html)

mrmustang 02-04-2022 07:22 AM
Muffler Alternatives
 
Having worked the tuning issues out with my 289 Roadster (may still need to replace current electric fuel pump with something better, waiting till warmer weather to investigate), I'm now wondering if anyone has tried an alternate muffler for their undercar exhaust, as the factory parts leave a less than desirable, raspy sound. Reminds me of the mid 2K's when everyone under 22 years old was installing 30 series Flowmasters on their late model daily drivers. Harsh, no real character if you catch my drift. Looking for more of that smooth burble/rumble, hard to describe in writing.


Bill S.

spdbrake 02-04-2022 08:29 AM
Bill,

These Flowmasters (don't cringe) have the same Laminar Flow as the Sidepipe mufflers they used to make. Moderate sound (50s style). 4" tall case. avail in 304 and 409 SS. THe Moderate lvl versions are, Case:18"LX5"WX4"T, (overall length 24"), 2.00-2.25-2.50 dia.+ no packing to blow out.

https://www.holley.com/brands/flowma...r_hp-2_series/

mrmustang 02-04-2022 09:33 AM
Quote:
Originally Posted by spdbrake (Post 1502969)
Bill,

These Flowmasters (don't cringe) have the same Laminar Flow as the Sidepipe mufflers they used to make. Moderate sound (50s style). 4" tall case. avail in 304 and 409 SS. THe Moderate lvl versions are, Case:18"LX5"WX4"T, (overall length 24"), 2.00-2.25-2.50 dia.+ no packing to blow out.

https://www.holley.com/brands/flowma...r_hp-2_series/
Come on over tomorrow and I'll let you hear it for yourself. Then you'll understand what I am talking about. :cool:

Bill S.

spdbrake 02-04-2022 09:54 AM
Love to. I'd like to check your GT500 as well.

mrmustang 02-04-2022 11:48 AM
Quote:
Originally Posted by spdbrake (Post 1502973)
Love to. I'd like to check your GT500 as well.
69 GT500 is now living in Texas, there is a identical color 1970 GT350 convertible in it's place.


Bill S.

Mark IV 02-04-2022 04:32 PM
Bill,

Contact me. My 289 exhaust is out with a manufacturer for prototyping and will have three muffler tones available and also be about 1" shallower giving more ground clearance.

mrmustang 02-04-2022 04:51 PM
Quote:
Originally Posted by Mark IV (Post 1502988)
Bill,

Contact me. My 289 exhaust is out with a manufacturer for prototyping and will have three muffler tones available and also be about 1" shallower giving more ground clearance.
Rick, I thought you used my car for the prototype measurements while it was there. Just want a nice throaty, but not obnoxious "burble". When you can, send me the details, you have my email :)

Thanks in advance,

Bill S.

cycleguy55 02-04-2022 07:53 PM
Quote:
Originally Posted by mrmustang (Post 1502966)
Having worked the tuning issues out with my 289 Roadster (may still need to replace current electric fuel pump with something better, waiting till warmer weather to investigate), I'm now wondering if anyone has tried an alternate muffler for their undercar exhaust, as the factory parts leave a less than desirable, raspy sound. Reminds me of the mid 2K's when everyone under 22 years old was installing 30 series Flowmasters on their late model daily drivers. Harsh, no real character if you catch my drift. Looking for more of that smooth burble/rumble, hard to describe in writing.


Bill S.
Nice video and audio here of Spintech mufflers on a Kirkham 289: https://www.youtube.com/watch?v=CoWTU90anG4

Spintech makes low profile mufflers as thin as 2 1/4".
https://spintechmufflers.com/low-profile-muffler/

krausewich 02-04-2022 11:41 PM
I watched a video on one of the Facebook groups for ERA owners recently... A guy named Rick Mignone had a nice Slabside with a good rumble. He's here in MA. I will ask if I can track him down!

https://www.facebook.com/richard.mig...23850940564831

mrmustang 02-05-2022 06:01 AM
Quote:
Originally Posted by krausewich (Post 1503002)
I watched a video on one of the Facebook groups for ERA owners recently... A guy named Rick Mignone had a nice Slabside with a good rumble. He's here in MA. I will ask if I can track him down!

https://www.facebook.com/richard.mig...23850940564831
No need to track him down, we know each other :cool:

mrmustang 02-05-2022 06:04 AM
Quote:
Originally Posted by cycleguy55 (Post 1503000)
Nice video and audio here of Spintech mufflers on a Kirkham 289: https://www.youtube.com/watch?v=CoWTU90anG4

Spintech makes low profile mufflers as thin as 2 1/4".
https://spintechmufflers.com/low-profile-muffler/
Thanks for posting the link, pretty close to what I'm looking for. Difficult to really get the sound right on the under car exhausts.


Bill S

Harpoon PV2 02-05-2022 09:27 PM
There's only one replacement muffler for a 60s car, and here it is! :D https://www.youtube.com/watch?v=GTZV...B44097E2AC10C5

mrmustang 02-06-2022 07:07 AM
Quote:
Originally Posted by spdbrake (Post 1502973)
Love to. I'd like to check your GT500 as well.
Great meeting you and your wife yesterday, hopefully you got where I was going with the tone of the exhaust. Look forward to getting out in the countryside with you guys in the spring.

Bill S.

krausewich 02-09-2022 11:23 PM
Rick said he was running these...

https://www.summitracing.com/parts/w...hoCpsEQAvD_BwE

cycleguy55 02-10-2022 09:49 AM
Quote:
Originally Posted by krausewich (Post 1503183)
I note those are 2" inlet and outlet, with a 3.25" thick case. All good as long as ground clearance is sufficient. Obviously those with higher HP engines would be looking for bigger inlets and outlets on their mufflers.

tkb289 02-10-2022 02:26 PM
Bill,

Like Rick, I am also running the Dynomax Performance 17762 mufflers.

It's essentially the ERA under car exhaust, but it turns out before the rear tire. It's tucked up under the car and the exhaust sounds great from idle to full throttle with a nice tone.

Other setups are less restrictive and will provide more horsepower, just depends what you are looking for.

There are some photos on page 23 of my ERA FIA build thread.

http://www.clubcobra.com/forums/era-...ld-log-23.html

Hope this helps.

- Tim

mrmustang 02-10-2022 03:49 PM
Quote:
Originally Posted by tkb289 (Post 1503205)
Bill,

Like Rick, I am also running the Dynomax Performance 17762 mufflers.

It's essentially the ERA under car exhaust, but it turns out before the rear tire. It's tucked up under the car and the exhaust sounds great from idle to full throttle with a nice tone.

Other setups are less restrictive and will provide more horsepower, just depends what you are looking for.

There are some photos on page 23 of my ERA FIA build thread.

http://www.clubcobra.com/forums/era-...ld-log-23.html

Hope this helps.

- Tim
Thanks, going to see what Rick has coming in first, then I'll decide what I'll be doing.

Bill S.

HealeyRick 02-11-2022 06:38 AM
You might take a look at Spintech Cruisers. I chose them for my 5.0 powered Healey because of their low profile: https://spintechmufflers.com/7000-cr...ofile-muffler/ I like the sound and they don't drone.

jolsen42 02-11-2022 09:50 AM
Bill. those Spintechs are what I'm using on mine. Love the sound. Nice idle and a mild throaty sound when accelerating.

John O


Quote:
Originally Posted by mrmustang (Post 1503007)
Thanks for posting the link, pretty close to what I'm looking for. Difficult to really get the sound right on the under car exhausts.


Bill S

mrmustang 02-11-2022 12:22 PM
Quote:
Originally Posted by jolsen42 (Post 1503228)
Bill. those Spintechs are what I'm using on mine. Love the sound. Nice idle and a mild throaty sound when accelerating.

John O
Passed through your neck of the woods around 7:30pm on Wednesday, should have called so I could hear them up close and in person.

Bill S.


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