This is certainly not a new topic, but I thought I'd share what I learned on my muffler replacement today.
First of all, I bought this muffler from Amazon:
https://a.co/d/cQRcacH
It came with the necessary gaskets for the flanges, as well as...
Yes, without the radiator, you can easily get an impact driver to loosen and tighten the crank bolt. When I did mine, I took off the radiator, it makes the T-belt job way easier!