UPDATE
After hearing my exhaust in videos from last year's season of autocross, it appears the "tinny" noise of this system is still there. Had a friend do a couple fly-bys to confirm as well. Appears the heart of the issue is Bassani's crossover pipe design and resonators as the same sound quality is also present on V6 mustangs with their exhaust. As a result I'm taking matters into my own hands.
Picked up a used set of Fast Intentions for a steal from a local autocross buff who just installed long tubes (can't say I'm not jealous) and have been researching ways to get a great sound without wanting to blow my brains out on highway trips.
After listening to dozens of sound clips of all kinds of set ups, I settled on redesigning from the rear axle forward. Using two 2.5" flanges for the RTPs, I'll have piping fabricated to lead into a Magnaflow Y-pipe mated to a 3" Vibrant 'ultra quiet' resonator, then out another Magnaflow Y-pipe and fabricated back into the existing rear section.
Please excuse my poor MS paint skills, but I think it captures the plan. Originally planned to use an Ebay Y-pipe, but noticed it would push everything back too far and hit the driveshaft, so this is the final revision. Stay tuned for sound clips after this is finished in March/April.