Actually just got off the phone with EvilSTI, and Im very happy he called me about this. I hadnt yet seen the post about it.
One of the other guys had called me previously about what he means. Apparently, there is a silencer-like insert at the inlet side of the resonator, that reduces the inlet size to 2". This piece is merely spot welded inside, and (atlien) was able to knock it out and install it, freeing up the restriction, and keeping the resonator at the same time. With this piece gone, it is then a true 80mm through out.
EvilSTI was very pleased to hear this, as he needs the exhaust installed by tommorow
I believe atlien may have used something with a rubber end to knock it out and free up the opening. This is great to know, since you can still have the 3" AND the resonator.
EvilSTI, thanks for the call, and please do let me know how it turned out and post some pics!!