Although the cabin noise level had increased, I was more concerned about exhaust fumes. As it turned out, the mufflers were too far recessed (as many of you had mentioned) and I did notice some exhaust fumes (which you also warned me about).
So I set about extending the mufflers outward. In the process I also inserted this venturi that was suggested to me by doug8867 from this site;
http://www.techtonicstuning.com/showpart.asp?partnum=VEN.250
That part was inserted into the extra 4" long pieces that I added just before the mufflers. I had no luck to sourcing some 2.5" polished SS stock so I had to canabalize my old set of test pipes. :(
So here's some pics of the process and some after shots. The below 3000rpm cabin noise level has dropped and more so, the +3000rpm cabin noise level has dropped significantly better. It's the quietest it's ever been which makes for great long distance driving in the future. I have also noticed that the acceleration is much more linear and feels a bit better as well.
A big shout-out to doug8867 for suggesting the venturi's. After the cut;
Mufflers with the extended pieces added;
Right side corrected, left side not;
Completed;
Next day pics;
1990 JDM RHD - Stage X
491.0 RWHP, 476.1 RWTQ, 18 PSI, Pump gas
26PSI w/Race gas = ???
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Re-positioning LaBree Mufflers - 
