Many people offer opinions on "ebay" mufflers, but i bet a very small percentage of them ever even had them on there supra.
Ages ago, when i had a NA, i put an ebay muffler on, similar to the one you put on the first page. It may have actually been even cheaper than that one. It sounded real good, and i was very pleased with it. When i converted my car over to turbo, i had no other choice than open DDP, or using that muffler.
I ran that $19.95 muffler for 2 years, and lots of miles. Its sitting in my garage in near perfect condition, and still sounds the same way it did when i put it on the first day.
I've since purchased mufflers, resonators and piping from summit, and have been extremly happy with them.
FWIW: If you search my old videos, i have a few of the muffler on my car, and it driving and spinning around a parking lot and such.