Anyone know what kind of waterbox this is?

[FLY6584]

Can anyone tell me what kind of waterbox is attached to that blaster b-pipe? I've never seen one before.

http://cgi.ebay.com/ebaymotors/Yama...010QQitemZ200035038283QQrdZ1QQsspagenameZWDVW

 

[crammit442]

Jetcraft turbomuff. Good waterboxes!

Charles

 

[SuperJETT]

Yep, probably the best boxes ever made, light, low mellow tone, and free flowing.