Mine was already done before I bought the car, but it looks like a Mandrel system like XR-7 mentioned, but mine has a dual in/Dual out flowmaster muffler in the middle acting as a resonator/drone reducer. My car also has chambered mufflers on the ends of the pipes making it quiet enough to not ire the neighbors/police, but when you get it past 3000rpm, she screams like a pissed off demon.
Stock manifolds, no catalysts, 2.5" from collectors to tail pipes.
Inside the car, 50mph, 2000 rpm.
Inside garage, startup, rev to about 3000.
In the driveway, some revs.
97 Thunderbird LX (The GT Bird)
PI Swapped NPI motor with some port work on the heads, PI cams, 80mm MAF, CAI that feeds from fenderwell. Jmod, 3.73:1 TL in Mark VIII carrier, Mark VIII aluminum LCAs, 93 Mark VIII driveshaft, PBR brakes (soon to be Cobras), 18x9 wheels, 255/40/ZR18 Tires, Front and Rear strut/shock bracing, GR-2 shocks, Eibach 1.5" springs, 1989 SC front and rear sway bars.