924Board.org

[timstar924]

Anyone know the dimensions of a 78 stock muffler. I think mine is the stock muffler or at least the same size and style. It is the round style muffler. And its a north american version 924. I don't think the exhaust system was modified or anything. I'm going to measure it myself tom, but i want to be certain and get the right size. Also i'm not sure how to measure the diameter of the part that is attached to the exhaust pipe.

[Vince Ponz]

If you can get a 944 muffler.
_________________
"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

[Smoothie]

[timstar924]

i was thinking diameter of the pipe that goes into the exhaust not the thickness of the metal.


I checked lordco today one place said they don't even have a listing for a 924 muffler and another place told me its a special order and said the muffler was 850 bucks! thats so weird.

i don't know where else to check in my area, canadian tire wouldn't have one for sure.

[Smoothie]

Those were instructions on how to measure the pipe, then figure the ID based on the OD or vise-versa by subtracting or adding the pipe thickness.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[timstar924]

i need to know the diameter of the inlet, like 2 inches 2.5 inches etc. and the exact lenght of the muffler. maybe if i just give the dimensions lordco might have one. i said porsche 924 and nothing came up in their computer and they said they just have a special order one for 850 bucks....

[gohim]

Porsche calls everything from the catalytic converter rear flange to the tip of the tailpipe the "final muffler" (comes welded together in a single piece).

Most companies that offer replacement mufflers for the 924 are going to sell the same assembly. That's probably why you got the $850 quote from Lordco.

You can probably order the Ansa OEM style "final muffler" assembly from one of a number of US suppliers for around $200US, including the shipping. The final muffler assembly is smaller enough, and light enough to be shipped by UPS. I have bought several small lots of brand new (924/944/924S/944S/951) final muffler assemblies from the local Porsche Swapmeet ($30-$40 each). I sold most all of the extra ones (sorry, no more spares) and shipped them by UPS Ground to their new owners.

If you decide to go for the "final muffler" instead of trying to replace only the rear muffler/resonator, I recommend buying the 944 final muffler 1/4" larger diameter tubing, and either adapting it to the 924 catalytic converter flange, or locating, and modifying a 944 catalytic/downpipe to fit onto the 924 downpipe output flange. This is a proven mod that should yield a 7-10hp improvement due to lower exhaust back-pressure.

A new Ansa 944 OEM style final muffler will cost you about the same amount as the Ansa 924 OEM style final muffler. It would not cost you much to have a Muffler Shop make an adapter pipe to connect to the 924 catalytic converter, if you can't locate a 944 catalytic/downpipe.

If you are trying to get away, replacing only the rear most muffler/resonator (which must be welded into place), you would be best off going to a local muffler shop, and having the local muffler expert choose a generic replacement muffler, and let him weld the sucker in. I would guess that doing it that way will cost you less than $75 US.

[timstar924]

i don't have money right now for the whole exhaust. I just wan the muffler. Lizard on this forum said he will weld on a new muffler for me if get the exact same dimension muffler so he can just remove the old one and weld the new one in. Thats why i need the inlet diameter and lenght and cirmumfrence of the muffler so i can go and ask for one at lordco and see if they have one that is the same as mine..

[Lizard]

get a tape measure and measure the length, then measure the diameter of the muffler at the end, as per pipe size it is PROBABLY 2" pipe but you never know what the PO may have done, I would just hold a tape up to the edge and eyeball it w/o benting the tapemeasure, if it looks close to 2" go to lordco and tell them 2" in 2" out and then approriate length and OD of the muffler, your measurements only need to be rough, they dont need a 100% accurate discription, also you dont need to tell them what car it is they wont have stuff like that in there computer, exhaust is exhaust if you own a ford or a lexus, however you dont know what PO have done so you just need to know the pipe size and muffler shape and diameter.
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3 928s,

[timstar924]

it looks like a stock muffler for a 78 924 doesn't look like it was modded. it is the round style muffler.


what is od? Also i'm not sure what the lenght of the muffler is, does it inlcud the pipe the inlet pipe and the tip or just the main 'body' of the muffler.

I'm still not sure how to measure the diameter of the inlet when it is attchached to the rest of the exhaust. Isn't something like circumfrence devided by pi (math) equals the diamete. i'll try my best to meaure it and go to lordco tom morning and see if they got something.

[Smoothie]

OD is outer diameter. ID is inner diameter.

Yes - measure circumference and divide by 3.1415 to get the OD.
_________________
"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Lizard]

[timstar924]

i won't be able to get the muffler before 9am... Not even sure when lordco opens.

[timstar924]

should i go buy a hack saw too or do you got one already?

[Lizard]

actually I talked to Kenodog and he said he has a hacksaw but doesnt know how good the blade is so you may have some tough cutting to do, lordco should open at 9:00am so I will say 9:20am then.
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3 928s,