Anyone with extra OEM 550 or 575 mufflers?

I’m here with the popcorn watching and enjoying and learning!

 

How come you didn't go with Fabios full system? Sounds great with the valved mufflers.

 

Very curious to hear this setup as well. Good luck with search. Depending on how active you want to get, maybe scour 550/575 listings for mention of “original mufflers also included”. It seems like a handful of the cars for sale with aftermarket mufflers make note of including the originals too maybe the seller would part with them

 

Do you have cats on the car? I have the oem manifolds, cats, fabspeed x pipe (came with car) and tubi muffler deletes and it not too loud.

 

This may not help your situation but I have one very nice late 575 silencer/muffler available. Would have to look again for which side part number.
As for using 550 and early or late 575 silencers they are not the best flowing units. Of those three the late 575 piece is the best. It was used when the center resonator was deleted for factory straight pipes. I looked at each of these with a scope years ago and added my comments in an exhaust thread here somewhere with some rough drawings and pics. Guessing prior to 2015. If I get time to search the thread out I’ll post a link.
Bill
FL

 

It have an xtra set of OEM 456M mufflers.
Not certain if they bolt right up but I also removed Fabio’s H-Pipe and went OEM resonator into Fabio’s muffler eliminators.

4th combination but worked and sounds PERFECT.

 

I have a pair of original 550 mufflers but without vacuum unit for the valves.
And the 2nd problem, i'm from Germany.

I don't need them.
Perhaps we get together ?
I think shipping is about 100 €
But how to pay without high costs ?

Daniel

 

fabio's headers, cats, center section & tubis
https://vimeo.com/manage/424840016/general

https://vimeo.com/manage/424839649/general

I did the 6-1 headers, 200 cell cats stock center & tubi's and it was too quiet - the center section set it off.

I have the stock components in a box.

 

456/456M mufflers will not fit.

 

I logged into Vimeo and the links did not work.

 

Sorry to sidetrack, but does anyone know if Fabio's 6-1 headers are available for RHD 550's ?

 

Here are some of my old 550 & 575 stock silencer/muffler notes.
Have two Maranello Silencers here, late 575 p/n 200997 & 998 (first pics) and 550 p/n 167998 & 999 (second pics). On these mufflers you have a single inlet coming in on the outer side of the car (relative to it's position on the muffler). At the rear, you have the two exhaust tips, primary side of exhaust on the outer side of car. The bypass valves are inboard and open possibly at startup for some years, and for sure under throttle up the RPM range. What I tried to show in these pictures is that the 550 exhaust comes in and hits a plate at 90 degrees, then routes left or right to respective locations. You can see no daylight through these.

On the late 575, the exhaust comes in the inlet, enters and bends around to the secondary/bypass side and you can see daylight looking through the muffler when the bypass valve is removed or open. It sort of goes out of it's way to go to the primary side of the muffler, forced there when the bypass valve is closed. It has a more direct route towards the secondary or bypass side provided the bypass valve is open. It has to have better flow at the very least when the valve is open.
Bill
FL

1st pic, Late 575 p/n 200998 bypass outlet (can see light), valve removed.

2nd, 550 p/n 167998 bypass outlet (flat plate @ 90 degrees) valve removed.

3rd, 550 p/n 167998 inlet side

 

Took a couple minutes to look further at the two mufflers previously mentioned above. Used a flexible digital scope to explore these a little further. Attached find pics of 550 diagram somewhat detailed and a very rough draft of late 575. Sorry about the technology.

Describing what's going on here (550), the air flow comes in at the inlet and flows down a perforated pipe that dead ends at a metal plate (see inlet pic in prior post above). The exhaust air can ONLY escape through the small holes you see in the perforated pipe. It escapes into the "muffler box". The only exit from here with the bypass valve closed is the primary exhaust tip which has a slightly smaller diameter exit pipe than the bypass side. Could not get an I.D. on this one, O.D. was 2.145" versus bypass pipe size of at least 2.25" I.D.. The exit pipes for the tips are solid (noted by bolder line) pipe ending short of the solid plate that is at the rear (front relative to car) of each respective exit pipe. There is an air gap of 2.5" between the end of the solid pipe on bypass side and the end plate, then an air gap of 3" between solid pipe and end plate on primary side.

On the drawing for the 575 muffler, the inlet air is basically a straight shot bending around slightly to the bypass exhaust tip. It has a solid section of pipe several inches long followed by a perforated section several inches long, followed again by a smaller section of perforated, ending with a few more inches of solid pipe. In this case, the exhaust air is directed to the bypass exit only getting out to the primary side through the perforations in the pipe, and more so when the bypass valve is closed. Note that the drawings are not in correct proportions.

In my opinion the 550 muffler can no way flow more air than the 575 when the bypass valves are open. Closed the 550 may flow more. Would probably take time on a dyno to know with certainty.
Bill
FL

 

Hi Mirek. Do you have any videos?

 

I cut my 550 mufflers open and modified them to make the car both silent as original and to get the back pressure the car has originally. I believe it makes the engine more powerful at idle and low revs and a tiny i grease in gas milage (important!! ... And when open, they were supposed to be free flowing with a Z-pipe that mad the exhaust go straight through. It was still lots of muffling effect. And later changed to valved Fuchs mufflers. Big upgrade in the sound, but it is not as quiet when valves are closed. Not a big deal to me. Interesting to see that OEM 575 mufflers are more straight through. The thing with the Fabio mufflers is that they actually make the engine give a different sound coming from the engine compartment too. And it sounds better in my opinion. Big decibel and loud car is not as same as a good sound experience. I have driven several cars that are quite quiet, but has a spectacular sound experience because sound is quite complicated and is a result of ALL the sounds you hear. My impression is that to reduce all other sounds is smart because it is more easy to hear the engine, and then the loudness/decibel level can be lower.

just my thoughts!

Erik

 

I do but it seems the 10 second file is too big !