Quiet muffler that doesn't kill power, does one exist?
 

I need to come up with a new muffler for my SC as the old Flowmaster 80 isn't going to cut it next year. I'm thinking Magnaflo 2-in/2-out this time but not sure if that will get me any lower db (figure 90db max at Limerock). I have two baffles crammed in the tailpipes now but it's killing power...

I think Ben of M&K has been asked about this several times. You might check with him. Everybody says his mufflers are great quality and a good value.

but, as Gary knows, you might need to baffle it for certain (lime rock) tracks.

Gary, I'm still a believer, go M&K, in 5 minutes, you can baffle it for Lime rock, unbaffle it for others.....

Lewis

Marv - Ben makes a great muffler but being quiet isn't one of it's attributes..
Lewis - I run straight pipes off my headers at all other tracks I go to, Limerock is the only one that (over) enforces sound restrictions.

You need cubic inches to quiet a car down, look for the biggest box that fits in the allotted space. If you are good w/ c/f you can make your own chamber that is contoured and extended into the available space, put the inlets right at the end of the collector ala the older twin inlet oems, internally you just run holey internals, stabbing the hole is better than drilling, the holey pipe is wrapped in f/g or ss or c/f wool, the longer the holey pipe is the better so perhaps a double pass(it will be harder to accommodate the 4 lengths) w/ outlet on the same side as the inlet for that bank

Alternatively the longest Burns race muffler that can be fitted transversely, 1 for each bank

Although my magnaflow is a 1 in 1 out with cat delete, it is pretty quiet and I believe it's a straight through design.
Low and rumbly but opens up when in the higher revs.

It's the sound at 6500-7000 that usually gets me... :(

I have a 2-in, 2-out "street" Triad and it is very quiet and makes decent power. I have actually taken it off the car and installed a factory sport muffler because the Triad was too quite for my tastes.

You might look into the Sycip sport muffler, sold here by our host. It is a great dual purpose solution.

I'm sure it's wonderful but for $1219 I will take a pass....

Would you want to sell the Triad? Which model is it? I have an email into them to discuss possible solutions.

Stock single out muffler.

The M&K is too loud for Limerock??? No way really????

I replaced my original design with a Dansk painted stainless steel and it's much quieter than the "original" probably because of all the holes in it! It looks much like the OEM and probably has been supplied to Porsche as OEM in the present and past. Got a great price, less than $400 on the net.

Tom

Dansk sport, 2 in, 1 out if your car has ssi's. It's not quiet and it's not loud at all-kind of perfect.

These are my headers, but I can fabricate anything to fit as long as they are 2-in..

http://forums.pelicanparts.com/uploa...1287682544.jpg

gary, have you been polishing upside-down? I thought this was your track car?

:)

very nice...jealous.

L

This is the Triad I have. It has a little surface rust, but is completely solid. I only used it for about 10k miles. I'd consider selling it. PM me if you're interested.

http://forums.pelicanparts.com/uploa...1287683657.jpg

That was when the pipes were new, and while they still look good I don't do any polishing!

What a design. Doesn't look like it would be very efficient but what do I know.

With that setup you could install almost any third party muffler(s) you wanted. I guess I missed the track car part.

Yes, I can make any muffler work, just need one that does the "magic" of making power while knocking sound down to sud-90db..

I recently switched from the Flowmaster to a (smaller) Magnaflow, and was surprised that the new setup is quite a bit quieter. One other change is 993 headers instead of B&Bs. But the Magnaflow did very well on the dyno and -- especially on track days -- I actually wish it were a little bit louder.

Old Flowmaster: big.

http://forums.pelicanparts.com/uploa...1283387445.jpg

Magnaflow: small.

http://forums.pelicanparts.com/uploa...1287686170.jpg

Jack - would you remember which model Magnaflow it was?

Thanks!
Gary

Gary,

I like Jack's set up. Wanna share the cost of buying 1 kit to experiment? then we'll split the cost of the 2nd kit of kit 1 proves adequate.

Also, i found a treasure chest of 15 inch wheels this morning :)

Fred

Also need to get an opinion on which way to point the tailpipes to minimize any readings. I was thinking straight down but then there may be an amplification bouncing off the asphalt. Set them the way Jack has them and it may be best as they only measure from one side.. if the muffler is quiet enough it won't matter.

Does one exist..?

Yes, absolutely, and even in daily use in some applications.

Electronic "anti-noise" engine mufflers have been around for quite some time now. It's possible they could even be switched off and on if one wished to do so. Most commonly used on diesel engine power generators in urban areas, QUIET zones, hospitals, etc.

put a turbo on it! they are quiet

for lime rock, I would dare say point towards the passenger's side.....most times I've seen them taking measurements, it has been along the driver's side....also, this will be quieter for the driver.

agreed, down will amplify the sound

you could point them towards each other, and hope they will be cancel each other out :)

This is my Lime Rock set up. The car has headers and a M&K RSR muffler. I got a cap for one side, an elbow, and a baffle.. I can obviously switch the cap and elbow side to side, aim the elbow etc..


Also on the headers I had v band clamps installed so I can easily put on megaphones..


http://forums.pelicanparts.com/uploa...1287693989.jpg



http://forums.pelicanparts.com/uploa...1287694012.jpg


http://forums.pelicanparts.com/uploa...1287694041.jpg

oops pic posting error


http://forums.pelicanparts.com/uploa...1287694122.jpg

the whole shebang

http://forums.pelicanparts.com/uploa...1287694705.jpg

That's the sort of thing I was referring to, except of course it's in steel instead of c/f

Lot's of internal volume to absorb the noise

teaser pics:

http://forums.pelicanparts.com/uploa...1287700810.jpg


http://forums.pelicanparts.com/uploa...1287700974.jpg

http://forums.pelicanparts.com/uploa...1287702066.jpg

Model 11386 - currently $81 at Amazon and it's stainless.

There are bigger models, but I needed to squeeze between the outlets of 993 headers.

Here's a picture of how it works:

http://forums.pelicanparts.com/uploa...1287703117.gif

I'm trying to figure out Steve's. Is that a solenoid for a bypass valve?

Whoa, it sure looks like it. Shoots the gasses thru the lower pipe right at the exit.

Weren't you using the Dynomax 17725 with the B&Bs?
If so which was quieter?

I would think I would use the biggest one I could fit, similar in size to the FM 80..

No, I had a Flowmaster. I never took measurements, but my belief is that the Magnaflow is quieter. Again, though, it could also be because the 993 headers might be quieter than the B&Bs.

The muffler Steve is using looks to be from a late model 911GT3. Not an inexpensive solution, and when the valves open, not quiet. Very cool street system though.