Hey gang! Sorry to leave you all hanging for the rest of the week. I took me several days to get my new exhaust mocked up and installed... however..
SUCCESS!
I just took the car out a few blocks, shifted through all of the gears -- no noises, no grinds, no hesitation. Everything is working just as it should.
BIG THANK YOU to everyone who's been a part of this thread. Dave, Zed, Chas, Mark, et al -- you guys rock! Thanks for being pillars of support in my time of need! This would have been a way more intimidating project without your guys' encouragement.
Now I just need to get used to my clutch engagement being so low -- I'm used to it being near the top of the pedal, and now it's a lot closer to the bottom. My neighbors must think I'm a complete newb at driving stick.