Literally every company that sells "performance exhaust systems" sells the muffler you want, there's nothing special about it. There are a few "one inlet, 2 outlet" for you on the page I'm linking. I personally like the sound of MagnaFlow, so that's the link you get. If you prefer some other companies sound, hit up their website or catalog.
Get the ultimate performance mufflers, custom fit to your car, truck or motorcycle with same-day shipping on ALL in stock orders! MagnaFlow manufactures the best glasspack, oval and round straight through mufflers in the USA using premium components and the latest technology.
www.magnaflow.com
Good luck... I always cringe when trying to buy a muffler. They either make or break the sound for me. I can't stand the sound of Borla for example. I think Borla systems sound like absolute s***, but, they are certainly well loved and respected by many. I'm more into the MagnaFlow, Thrush, or FlowMaster "turbo muffler" note versus (my opinion) Borla's flimsy/tinny reverberating straight-pipe noise.
Ya. Certainly no lack of choice, and that in itself is paralyzing without a doubt. Maybe go to a Classic Car Show and sample the sounds. When you find one with a note you like, ask what it is and go for it.
I was just going to ask this. What size should stock be? I measured and it appears to be 2in but it also says 1.75in on the section of the intermediate pipe that meets the muffler, It’s rotted out.
Sometimes the part that goes into the muffler is a different size than the rest of the pipe. And I don’t know the details of the 2nd Gen exhaust. Which is rotted out, the muffler or the intermediate pipe? Or both?
Sounds like you are after a replacement crossflow muffler. Drive into nearest exhaust shop and let them look. After nearly 50 years, the exhaust may have had an almost stock replacement added a few times, especially the muffler. As we say for every time you start a new topic of same subject, talk to an exhaust shop.
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