I have a 68 convertible that will soon need some replacement mufflers. The last set I put on was probably 15 years ago and they were called turbo style at the time. I am running a stock, under car system that exits out the back. I would like to find a low restriction muffler that uses original style hangers and lines up with the exhaust cut-outs. Can anyone help me out?? Thanks

 

Here is a chart I found a while back but you are on your own as far as fittment:

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

 

Great information. I love the sound of my Flowmaster 40's. Lots of people complain about resonance but I have none. I guess it depends on the diameter of the exhaust and if you use an X or H pipe. I use 3 inch diameter pipes and an H pipe

 

I had a pair of Flowmaster 50 series mufflers installed on my '81 afew years ago, and they fit "Perfectly" and fit on the original hangers, etc.. Never a problem since, and they flow super well. Good Luck.

 

Nice!
One hour after asking a question a list of 17 different systems are listed with performance and sound level

 

I went with 21/2 inch pipes and Dynomax high flow mufflers and love it at 30 mph you can't hear them but at idle they have a nice rumble .

 

I went with the 2.5" N-11 system from Corvette (Exhaust) Central. Best sound I've ever heard.

http://www.corvettecentralexhaust.co...k_off_road.php

Check the videos on the right. They are on a C-2, but its the same system.

Here is the system on my car.

http://s108.photobucket.com/albums/n...t=IMG_0124.mp4

 

My 3" Magnaflow system...(video)

 

Mufflers sound great on your car...did you get the fully welded exhaust pipe and muffler or just the mufflers?? Exhaust tips look lined up nicely in openings, were there any problems installing them or getting the mufflers to align properly.
Thanks, Chris

Here is the system on my car.

http://s108.photobucket.com/albums/n...t=IMG_0124.mp4[/QUOTE]

 

Holy crap that sounds nice! Stock cam, right?

 

I got the fully welded system since I was changing over from headers and side pipes back to under the car. I'm also running 2.5 inch manifolds instead of the stock 2 inchers. I had the system installed, so I cant speak to how easy they are to align, but they do seem to fit very well.

 

Guys I've been using Cherry Bomb Turbo Mufflers for, well since I was a kid.

They are less money and to me have that special rumble.
Since I put in the 700r4 all you can hear now is the wind at 70mph at 2100rpm

Here is what they sound like. Click on the picture.


It may take a few to load the file, but it still makes me smile.

Ralph

 

For true performance you want to match the CFM flow of the mufflers to the CFM of the carb/motor. A successful system is one that the engine sees as not being there.

 

....uh, yeah,...base engine, stock, 300 horse

 

Everyone!
I use Flowmaster Super 40's. I have tried several. My first set was the original single chamber 40's but they were so loud and the resonance inside the car at highway speeds was a deal breaker for me. The Supper 40's eliminated that but still has plenty of "growl" and a "roar" when I get on it. They flow very well and are supposed to out perform the original 40s. I get compliments all the time as to how good it sounds. I am running a 427 small block.

 

I put a pair od Pypes, Viliator mufflers on my 81, they sound GREAT! They are a little loud, but for me that is good, I can't hear anyway!

 

Here is a chart I found a while back but you are on your own as far as fittment:

The results in HP order:
1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).


Spikebot81 - What baseline performance numbers were used to base those numbers on? Was is a 350CI/350HP engine? Great info!

 

Funny, that's exactly what I suspected. I heard one of those once and it sounded just like yours.

 

[B]ALLEN'S STAINLESS / great "STOCK" set up mufflers !!!

www.allencorvetteexhaustsystems.com

click the vid links below for sound / keep in mind my car is stock but it's a big block with 2.5" exhaust. Hope this helps .


http://www.youtube.com/watch?v=TPMcJ...feature=relmfu

 

Just a word from my own experiences. Keep in mind that if you want to hear the sound that you will get from a muffler on a C3 you will need to listen to it on a C3. Since there are virtually no tail pipes on these cars any muffler will sound different/louder than it would on say a Chevelle.

Good luck!