I'm worried about this also...
When I bought the car, it had: gutted manifolds
custom dual exhuast down pipes (I guess you'd call them?)
dual 2.5" flex pipes
small y fitting
2.5"/3" adaptor
3"/3" Dynomax Ultra Flow in resonator spot
A 3"/3" Y pipe
dual 3"/3" Edelbrock mufflers
3.5" chrome angle cut tips
Now the car has:
W-R Headers
custom dual exhuast down pipes (I guess you'd call them?)
dual 2.5" flex pipes
small y fitting
2.5"/3" adaptor
3"/3" Dynomax Ultra Flow in resonator spot
A 3"/3" Y pipe
Rusted through/broken Edelbrock Mufflers
3.5" tips
Car is going to have (whenever dude's shop finally gets repaired... damn CE 
):
W-R Headers
W-R Y pipe
2.5" flex pipe
2.5"/3" adaptor
3"/3" Dynomax Ultra Flow in resonator spot
A 3"/3" Y pipe
Dual 3"/3" SS Dynomax Ultra Flows
3" tips
I had a feeling after looking in one end of the Ultra Flow and saw 3" of nothingness all the way thru that I won't pass inspection in January, unless I get a cool inspector dude. 
