You know that I've been trying  to  find  just that muffler.  I liked the tone of the  FM 50s you had  on the 351 but I never was in the car at speed.    What we have  now are just too dead.  They are easy on the  ears at speed but sound crappy when you push the go pedal.  The muffler shop called them  "stock replacement" but I never did find out exactly which stock muffler they  were replacing.

Back  in 78 I put a SBC in my 55 Ford 1/2  ton PU.   Yeah, yeah...don't want to hear it!  Anyway I used a pair of Walker BU-69 mufflers and It sounded just right.  A bit of rumble at idle, good sound on the  pedal and very tolerable at cruise.  That truck had a 4.10 with a Warner .7 OD so it was a good comparison to our overdriven Mustangs...except the  Bowtie engine.  Problem I see though as I recall, is that those mufflers were a bit long for he Mustang.

Absent something like you are talking about, I plan to try the 50s and add resonators or short glass packs near the tips....like  Ford did.

BB
 

Rudy, is that like the setup NPD sells?  I've thought of going stock so that may be the answer.

Rudi wrote:

I love the sound of my stock 2 1/4 inch GT set up. It has a custom "H" pipe, resonators on each pipe and the stock transverse muffler behind the axel.

 My engine is a 331 CI,Performer Eddy heads,  220-220,.512 lift 110LSA Comp cam, 9.1 to 1 forged Probe pistons. 670 Street avenger carb.

I have toyed with having a set of custom bent stainless pipes made with Magnaflow sound deadeners but with no gaurantee on the sound I have chosen to keep what I have.

The sound at start up and idle is a nice but noticable rumble, at acceleration it is throaty and not attention getting, at cruise there is no loudness with virtually no drone or racket.

 I do not like loud exhausts or ones that are too quiet either.

The only thing you may not like is the large transverse muffler which is heavy. 

I think I just answered my own question.  After looking at the NPD catalog it appears that they don'd sell a 2.25 system in stock form for the 66 GT.

BB

MustangSteve wrote:

Would there be any market for a QUIET muffler that actually fit the 65-70 Mustang? 

I have been shopping for mufflers for my car and nearly every single one of them advertises a deep throaty sound.  Does anyone besides me want to have a car that is not totally silent but is not obnoxiously loud?  Seems like as alot of the Mustang crowd gets on in years, they might want to actually be able to hold a conversation in their car and not rattle the neighbor's windows every time they go out for a cruise.

I tried Dynomax VT mufflers that said they were quiet until you got hard on the throttle.  If you can stand all the clanking and banging noises, they are pretty quiet (other than the internal clanking and banging) as long as a cruise speed below 65 MPH is maintained.  Once you go faster than 65 in my car, they are straight through, wide open, obnoxiously loud.  Basically a joke as far as something that actually works in real life.

I am seriously thinking of manufacturing my own mufflers that are tuned to the car and do not put out alot of noise.  There has to be a way to get there.

Should I just build a one-off set to satisfy my own needs, or is this something that would be marketable?  I know there are the 6sally6 types that enjoy obnoxious mufflers, and to them it may be music to their ears.  Personally, I would like to still have my hearing intact when I get older.  Does everyone like it loud or is quieter than what is now available a preference?

Please reply to list what engine you have and what mufflers you are using and whether you like them or not.

 
Steve the JBA's have a nice exhaust note and are not loud like Flow Masters...jj

MustangSteve wrote:

Would there be any market for a QUIET muffler that actually fit the 65-70 Mustang? 

I have been shopping for mufflers for my car and nearly every single one of them advertises a deep throaty sound.  Does anyone besides me want to have a car that is not totally silent but is not obnoxiously loud?  Seems like as alot of the Mustang crowd gets on in years, they might want to actually be able to hold a conversation in their car and not rattle the neighbor's windows every time they go out for a cruise.

I tried Dynomax VT mufflers that said they were quiet until you got hard on the throttle.  If you can stand all the clanking and banging noises, they are pretty quiet (other than the internal clanking and banging) as long as a cruise speed below 65 MPH is maintained.  Once you go faster than 65 in my car, they are straight through, wide open, obnoxiously loud.  Basically a joke as far as something that actually works in real life.

I am seriously thinking of manufacturing my own mufflers that are tuned to the car and do not put out alot of noise.  There has to be a way to get there.

Should I just build a one-off set to satisfy my own needs, or is this something that would be marketable?  I know there are the 6sally6 types that enjoy obnoxious mufflers, and to them it may be music to their ears.  Personally, I would like to still have my hearing intact when I get older.  Does everyone like it loud or is quieter than what is now available a preference?
Why not just buy a pair? I'm sure there are mufflers out there to meat your needs.  The "turbo" type mufflers are very quiet.  I had them on my 5.0 and was not happy how quiet they were.
Please reply to list what engine you have and what mufflers you are using and whether you like them or not.

Bullet Bob wrote:

Rudy, is that like the setup NPD sells?  I've thought of going stock so that may be the answer.

  should have mentioned my car is a 68, the 66's never came with a big block engine.
 The two can't be that much different, can they?

jerseyjoe wrote:

MustangSteve wrote:

Would there be any market for a QUIET muffler that actually fit the 65-70 Mustang? 

I have been shopping for mufflers for my car and nearly every single one of them advertises a deep throaty sound.  Does anyone besides me want to have a car that is not totally silent but is not obnoxiously loud?  Seems like as alot of the Mustang crowd gets on in years, they might want to actually be able to hold a conversation in their car and not rattle the neighbor's windows every time they go out for a cruise.

I tried Dynomax VT mufflers that said they were quiet until you got hard on the throttle.  If you can stand all the clanking and banging noises, they are pretty quiet (other than the internal clanking and banging) as long as a cruise speed below 65 MPH is maintained.  Once you go faster than 65 in my car, they are straight through, wide open, obnoxiously loud.  Basically a joke as far as something that actually works in real life.

I am seriously thinking of manufacturing my own mufflers that are tuned to the car and do not put out alot of noise.  There has to be a way to get there.

Should I just build a one-off set to satisfy my own needs, or is this something that would be marketable?  I know there are the 6sally6 types that enjoy obnoxious mufflers, and to them it may be music to their ears.  Personally, I would like to still have my hearing intact when I get older.  Does everyone like it loud or is quieter than what is now available a preference?

Please reply to list what engine you have and what mufflers you are using and whether you like them or not.

 
Steve the JBA's have a nice exhaust note and are not loud like Flow Masters...jj

 jj... I sold the JBA mufflers that came with my system because you stated they were going to be loud from your experience...????????????????????

MustangSteve wrote:

I used to have flowmaster 50's on the car and they were nearly silent at any cruise speed and had zero drone at any speed.

I thought you were happy with the 50s.  Why not just get a pair of them for the new system?

BB

What about supertrapp mufflers? I recall a friend having supertrapps on his 70 torino gt.  I don't recall the sound, but I remember that you remove baffle plates to make quieter add more torque, and add them for noise and HP.

Bullet Bob wrote:

I thought they sounded pretty good and were quite quiet for normal driving.  As for loud on accel...well, I thought that's why they call it the "loud pedal".

I do recall you mentioning that they were tough to make  fit due to length.  Was that with 2.5 or 2.25 pipes?

BB

 The old system had 2.5" from headers to mufflers, then 2.25 from mufflers to the tip.

As exhaust gas cools, it takes up less volume, so the farther from the heat source, the smaller the tube can be and still maintain same pressure.

MustangSteve wrote:

jerseyjoe wrote:

MustangSteve wrote:

Would there be any market for a QUIET muffler that actually fit the 65-70 Mustang? 

I have been shopping for mufflers for my car and nearly every single one of them advertises a deep throaty sound.  Does anyone besides me want to have a car that is not totally silent but is not obnoxiously loud?  Seems like as alot of the Mustang crowd gets on in years, they might want to actually be able to hold a conversation in their car and not rattle the neighbor's windows every time they go out for a cruise.

I tried Dynomax VT mufflers that said they were quiet until you got hard on the throttle.  If you can stand all the clanking and banging noises, they are pretty quiet (other than the internal clanking and banging) as long as a cruise speed below 65 MPH is maintained.  Once you go faster than 65 in my car, they are straight through, wide open, obnoxiously loud.  Basically a joke as far as something that actually works in real life.

I am seriously thinking of manufacturing my own mufflers that are tuned to the car and do not put out alot of noise.  There has to be a way to get there.

Should I just build a one-off set to satisfy my own needs, or is this something that would be marketable?  I know there are the 6sally6 types that enjoy obnoxious mufflers, and to them it may be music to their ears.  Personally, I would like to still have my hearing intact when I get older.  Does everyone like it loud or is quieter than what is now available a preference?



Please reply to list what engine you have and what mufflers you are using and whether you like them or not.

 
Steve the JBA's have a nice exhaust note and are not loud like Flow Masters...jj

 jj... I sold the JBA mufflers that came with my system because you stated they were going to be loud from your experience...????????????????????

 Yeah but did you enjoy wasting the money?  8)

I did exactly what Jeff in Ga did.   Much improved but could be better.  MS, what about the fit of the 50s you didn't like?  Length, width,,,???