Fixed it. It turns out it was caused by the tension being set too high. I'm not sure if that was the cause of the original noise (may or may not have been the same), but this afternoon I tore everything down, adjusted the tension (very slightly) and put everything back together in 3 hours. 
Thanks to all who posted! 
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MODS: VLSD 5-Speed Swap, Exedy Stage 1 Clutch, Turbo Manifold Studs, Koni/Eibach Suspension, Suspension Techniques F & R Swaybars w/ Blehmco RSB Links, Unorthodox Racing UDP, Blehmco Grounding Kit, WSP Y-Pipe, Place Racing CAI, Custom STS, Polyurethane Front & Rear Bushings, Q45 Front Brakes (Blehmco S.S. Lines, Brembo Rotors, Axxis Metal Master Pads), Courtesy Nissan FSTB, Blehmco RSTB, Blehmco Stage II LTB, NissanWorks TB & IACV Spacers, 9007 Headlight Bulb Conversion, GXE Fog Lamps, Sound System (Infinity, JVC, Polk, MTX), 2k3 SE 17" Wheels w/ 225/50R17 Hankook HR Ventus II Tires - 186K miles (bought 8/03 @ 87K miles)
Other Toy: '96 Corvette LT4 6-Speed, 75K miles (bought 3/09 @ 60K miles), Black on Black, Fassstt!!!! Stock, for now...
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