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If it fits and works as well as their 1 7/8" longtubes it would be a great buy. I took a gamble on their LT's and I'm happy I did, fitment was perfect and price was half that of everything else while being 409 stainless.
Sometimes, for the price, you just need to try it given your other options. Typical radiator issues are leaks along the welds or mounting tabs in the wrong place...both of which CAN be fixed by a local welder if needed.
If the Dewitts or Ron Davis are 2x the price, I think I'd take the gamble and try it.
TPS is a known vendor who makes quality parts. If they're selling a 2-row core aluminum radiator, it likely increases coolant capacity noticeably and cooling capacity / heat rejection significantly.
If it's anything like the dewitts radiator I have installed, and I imagine it's in the neighborhood, it's a very worthwhile upgrade if you're doing any sort of track driving, or if you have forced induction. I recommend fancy fans to go with it.
Except for those whose upgraded radiators sprung a leak (which is kinda common on the ebay special radiators but not on the more expensive ones sold by reputable vendors), I imagine almost nobody has done comparison tests, since I imagine almost nobody has been unsatisfied with theirs ... but that's my guess.
I love the description. Translation: "Don't expect yours to look this good without some work."
Yeah, that's kinda funny, they just cleaned it for photos to make it look prettier. Thankfully the radiator is hidden by a shroud and generally doesn't need to look pretty to work great!
There are long threads about ebay radiators on this site. The short version is: caveat emptor. Many people report being unhappy with them - perhaps immediately, perhaps after six months, perhaps after two years. Too high a chance of leaking and corroding. Slightly imperfect grounds will speed up corrosion too.