RE: Not happy with Proline... :o(
Dude, relax, it took me 30 seconds to find that picture on X-rays site. Sure looks like it works there. Maybe if you'd have asked this question before you broke out the dremal your body wouldn't be hacked up, and you wouldn't be upset and bashing Proline.
Did you try rotating the carb barrel link down?
Also, I believe that body is the same for the MBX-5,, It's been my understanding Proline doesn't make one special for the xb8. I might be wrong, but if that's true you should be upset with x-ray for using what ever the can get their hands on, not Proline
p.s. I don't see a problem with the pipe cut out, at least I can't tell from your picture