I live about 10 miles from Cape and I think I own the car you saw with duals.Was a friend of mines when it had duals.It had 2.25 in. pipes and 2.5 in/out 40 series flows.Worked ok but I used to do exhuast and wasn't happy with the way it looked.I think one 3 in. pipe and one flow is just as good on most combos.The problem in the rear corners is most mufflers are to long,you almost kink the pipe getting into the mufflers.The one muffler that may work is the one chamber flows.They are much shorter in length.

 

Thats cool! I may go with the 1 chamber FLOWS!!!! Later man!

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'91 GTA:5.0TPI-5-spd, Hypertech Stage 2 chip, 160stat,!TB,!Cat, K&N, Flowmaster muffler, Accel Coil,TPI Air Foil, 1LE Alum DS, poly-tranny mount, KYB's all around, & a Hotchkis Strut tower brace.
Mods in progress:
-L98 w/ZZ4 cam/springs
-Edelbrock headers
-3" flow setup
Future:
-T56/heavier clutch
-Hurst or Ripper
-4.10's
-Ram Air II Hood
-1.5" Springs
-Rebuild suspension!
Others:
-39 Chevy coupe
350/350/3.55posi
-52 Chevy p/u
-77 Bonneville 400PONTIAC/400turbo/posi
Original 50k mile 2 door... Gramp's old car!
*** Gotta love those Poncho's***