Blaster B1 factory limited pipe questions?

Hey everyone I have a mint factory limited pipe on my b1 I noticed a little smoke leaking out of it the other day so I pulled her off and found a crack running along the weld lines on the back side of the pipe, anyone have this problem? Also anyone know what the pipe is made of so I can get it welded? I believe it's aluminum but I'm not positive?
 
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