i think i got the number right:
Depo 28x6x3=504
Pwnall 28x6.25x3=525
Whoosh 28x6x3=504
there are actually two Chinese intercooler i have found
ACS 24x6.5x3=468
CSK 28.8x4.92x2.56 =362
so none of the ebay/aliexpress ones are identical to the 3 sponsor's
I'm pretty sure for the 3 vendors there was some confirmed rounding on the core size, I'm 99% sure they are identical... and I'm not sure how the inlet/outlet size goes, but I think most are 2.5" but the ACS is 3" but again, not 100% sure how the sizes work but sound like for the ACS 2- 3" to 2.5" adapter hoses or 3" hoses/pipes would be required and deter even more from it's value that isn't that great considering you are looking at ~$225 shipped from China to start with. For those curious, there is an old thread on the "dead" forum that lists all the core sizes of every IC available as of mid '16, hehe,
HERE there are 2 sections you have to scroll down past a few posts to the second set and it makes me wonder what rounding was happening on core sizes as Cobb looks very close to our current vendor trio too.
Anyway, glad to hear Whoosh is coming out with a v2 and happy we have such great vendors passing along good values in general. Just can't go wrong with any of those 3, and like Ron says, there may be some very minor plastic trimming needed but his new V2 won't need that at all and will be priced about the same... I know which one I'm holding out for!