My DIY Muffler Mod...
#16
Three Wheelin'
Thread Starter
Originally Posted by ANDREW DWORAK
Jeff, great work! Would it be possible to cut along the original seam to make the conversion rather than 1" down. This would preserve the original look. Andy.
#18
Three Wheelin'
Thread Starter
Originally Posted by 993inNC
You did TIG weld those cans back together didn't you Jeff? Not MIG?
#19
Race Car
LOL.....I hear ya. Well at least you had it done right I don't know, but I would imagine that Porsche had someone sitting welding muffs all day. It takes a good hour a piece to do them right, my guess is they aren't made with top quality SS and a quick weld by machine is all thats necessary. I have multiple sets for our doing our (DACH) modified muffs and they all pretty much look the same from the factory.....crappy!
#21
Three Wheelin'
Thread Starter
Now my car is totally GUTTLESS !
Originally Posted by rwestervelt
Hey Jeff
Any update on this front? I am preparing to do an internal LPMM.
-Rick
Any update on this front? I am preparing to do an internal LPMM.
-Rick
What I ended up doing was a complete internal gutting of the muffler. It has worked well for friends on their motorcycles, so I thought that I would give it a try. I cut the pipes where you see the red lines and discarded everything to the left, and stitched the cans back up. (see picture below) I got the cans done and mounted up on Saturday, but I haven't had a chance to do much driving yet. My impression so far, is that they are a much deeper tone at idle than either stock or my previous mod and they have a bit more volume too, which is exactly what I wanted. As the throttle is opened up I was afraid that these would end up being too loud, but they have ended up about right in tems of volume for me. I wish that I had heard the DACH's, RSR's or LPMM's in different sizes to give you a comparison. I will do a more complete wrte-up one I have had a chance to drive with them a bit more.
#23
Rennlist Member
Jeff, it looks like you'll have basically no mufflers at all after this, more like a really big bypass pipe! Hopefully you won't have resonance with that big empty can.
Which makes me wonder, why doesn't someone make something that just connects the cat to the tip directly (as in the red arrow below - Jeff, I hope you don't mind me stealing your pic). I guess that's basically what a supercup muffler is...
What about a simple turn-down pipe at each outlet of the cat? (asside from the fact that it would look terrible)
Which makes me wonder, why doesn't someone make something that just connects the cat to the tip directly (as in the red arrow below - Jeff, I hope you don't mind me stealing your pic). I guess that's basically what a supercup muffler is...
What about a simple turn-down pipe at each outlet of the cat? (asside from the fact that it would look terrible)
#24
Three Wheelin'
Thread Starter
Originally Posted by brucec59
Jeff, it looks like you'll have basically no mufflers at all after this, more like a really big bypass pipe! Hopefully you won't have resonance with that big empty can.
Which makes me wonder, why doesn't someone make something that just connects the cat to the tip directly (as in the red arrow below - Jeff, I hope you don't mind me stealing your pic). I guess that's basically what a supercup muffler is...
What about a simple turn-down pipe at each outlet of the cat? (asside from the fact that it would look terrible)
Which makes me wonder, why doesn't someone make something that just connects the cat to the tip directly (as in the red arrow below - Jeff, I hope you don't mind me stealing your pic). I guess that's basically what a supercup muffler is...
What about a simple turn-down pipe at each outlet of the cat? (asside from the fact that it would look terrible)
After I cut out all the internals, I briefly considered installing a 180 degree bend to connect the inlet and outlet, but decided that it would probably be too loud. A turn down straight from the cat could probably be done well enough to not be too ugly and would save quite a bit of weight, but I am sure this would also be way too loud... at least for the street.
You might think there was no "muffling" going on in an empty can, but there definitely is. There is a bit of resonance, but it isn't too bad. There is also a very slight slight burble when under deceleration / engine braking. It isn't a popping like an exhaust leak, but more of a rumble. My current plan is just to live with them for a while before I do anything else. I may eventually do the LPMM to my previously modded cans ... who knows.
This project has been an experiment for me, and I am sure the experimenting will continue.
#27
Three Wheelin'
Thread Starter
#29
Three Wheelin'
Thread Starter
#30
Burning Brakes
I do not want the sound level to be to far away from stock.
If I want more sound i can always get a cat bypass, and than easily go back if I am taking the family along for a trip.
When i was polishing my left muffler i noticed that it was pretty beat up, it had several thin cracks and i was really struggling to get it apart. The "seem" on top of the muffler also was starting to open up.
Has anyone seen this on their mufflers ?
Doesn't seem like it has been in a accident or nothing, more like it is just getting old (the car has 65K miles).
I TIG'd the seem but filled the cracks with MIG.
The right hand side muffler was good as new, both are Gillet's stmped with 95/11.
I won't be driving the car until May but i might post a sound clip from the garage before that