Dynomax "Lifetime" warranty

i always thought the the super turbo had a lifetime warranty, but i bought a set last month and i dont see it anywhere. didnt they just switch the welded mufflers over to stainless? i had a magnaflow then end of it cracked and blew out, it blew out all of the packing too. i had no reciept so i was s.o.l. it looks liek they too switched all mufflers over to stainless. i guess it was cheaper for them to spend a little bit more to make them and have less warranty issues.