This is all just wrong.
Either it's a "performance" part, and there's no warranty whatsoever Shawn, or you stand by the product. Pick one. That's part of where the problem lies. If it's no warranty then come right out & say it: "There is no warranty on this part. Sorry, have a nice day" when the customer calls complaining. It's one thing to be on the website, it's another to say it & get a confirmation that the customer understands that. Then, the only thing you should say is the same exact thing when said customer posts the warning online, and not be ****** that "we're all backstabbers" - the product is junk Shawn, plain & simple, and has been since day one when they left the back door. But, it's a performance modification, therefore it can't handle the job asked of it. Oh wait, Quaifes do. A Quaife must be a maintenance part then, and not a performance part. See, here's the thing that gets me Shawn - these things are blowing up on the way to get coffee, not on the racetrack stuffed in heavily modded SHOS like the limited number of Quaife diffs that have gone buh-bye.
Chuck, if you bought the "no warranty version", be glad you got any kind of a replacement. If there's any kind of warranty, get what's due you, even if it's a new LSD. It may not be what's desired at this point, but it's what you paid for, and it's something. Cash refund, check with IPT's official refund policy. I also originally assumed a clutch-disc type, but I understand Shawn's explanation of the term "clutch".
Shawn, pick a course in your life, be it musician, student, or SHO Parts Vendor. Do all three if you want, but keep them separated. If a customer calls you, (whether to order, to check on a shipment, or to complain that "their freaking car blew up AGAIN"), the last thing they want to hear is any kind of shift of focus. Don't shift the focus & mention how late you stayed out jammin' with da boyz, how you can't make it to the post office to ship a product someone's paid for because you have midterms this week (unless it's to offer a timeline of WHEN your end of the deal is going to happen), or how Joe Schmoe's Honda works with this product, but it's not working on our cars, "gee, really, it's Ford that screwed up, not us...". Ford doesn't sell IPT diffs, you do. We especially don't want to hear about it here on SHOForum how Honda LSDs are so fantastic. Tell it to MugenPowerOnline or something. The bottom line is, the IPT MTX SHO differential has a very shady history, to say it nicely.
And be careful mentioning that one special ATX diff you keep referring to, as it's my understanding that it was "enhanced" after leaving your hands. You can't take the credit for a piece that's not completely your own, especially when the customer has to have it beefed up prior to installation for fear of it blowing up. Oh wait, it was already in the car, and he paid twice, once to have it installed, and once to have it removed before even gettign the car back...
See where we're going with this? Nail down a position on this Shawn. Keep the product, ditch the product, support the product, don't support the product, offer a replacement, don't, offer a refund, or don't. Establish a position & stick to it.
Oh BTW, I was going to reply this morning, when I first started reading your replies to this situation but decided not to, and to instead bite my lip. This version was prompted by your 2:55pm post which just pushed my last button with your side of the argument, and is FAR more tame than this morning's was going to be. I did save a copy of the pretty damning version of your track record, if you insist on reading it.
I suggest you both deal with this offline at this point, as it's only going to get much uglier from here, and will likely result in a settlement / situation that isn't good for anyone involved. Post this stuff publicly, and of course the public is going to become a participant.