I was wondering if the TRD muffler from the Gen 4 Camry will fit on a 1999 Avalon. I have asked Gabe and he said he wasn't sure. I have pictures of my stock muffler for comparison:
I just installed the TRD muffler on my Camry the other day and it looks really similar. Toyota probably used the exact same exhaust on all cars with a 1MZ.