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931 rear muffler change

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Joined: 29 Jul 2001
Posts: 8298
Location: Royal Oak, MI, USA

PostPosted: Mon Mar 30, 2020 4:36 am    Post subject: 931 rear muffler change Reply with quote

Posted to the 931 FB group, thought others here might be interested but may have missed it:

Cut off the stock rear muffler. Welded on a short bit of bend to have a straight section to slip the replacement on. Videos included of stock, with NO muffler (aka straight pipe tractor sound!!) and with the replacement, a Dynomax #17263 (purchased from JEGS).

Note: this was purely for aesthetics, to add some more character. Stock muffler is indeed a straight-through muffler, just as the Dynomax is, FWIW.

Driving around, does have a touch more bass than stock, but I wouldn't have minded even a bit more noise. Definitely quieter than all the Scoobies around here, even my wife's WRX with an axle-back! LOL

But at least it doesn't sound bone stock any more...

Will probably swap in a few different rear sections just to experiment, as it's set up to be modular now, easy to change. For one, I have a rather small race bullet Dynomax muffler (we use on the #77 ITB NA car), thinking the smaller volume will let even more turbo awesomeness out the back... Definitely no drone with this setup, though.

Then once that's done, I need to rig up a more proper, less jury-rigged rear mount (will adapt to the stock muffler hangar) and put a proper extension and tip to get it out to the rear bumper.
Vaughan Scott
'79 924 #77 ITB racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype
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