2.5 in and out of the cat
2.5 into the resonator
2 out of the resonator till the y
1.75 from the y to the mullger
2 out of the muffler to the tips

so what are the finally demisons in and out its a little debated

isnt it 2.25" after the res up to the y and then dual 2" into the mufflers?

ok i have a 93 bonneville SSEi and im looking for a nice performance exhaust i have money to work with just wondering what would make it sound the best and where to get it at. TY and hope i get some good suggestions.

Flowmaster and magnaflow both make good mufflers. Each has a slightly different sound.

exhaust
 

so if i were to go to one of those companies what would be the best size to get for a full exhaust system from the headers all the way bak and do u have a slight price range? ty for the help : )

You should have a tainless exhaust, there should be no reason to replace the whole thing

like danthurs said your exhaust is stainless so i would save the money and leave the stock piping, have a high flow cat welded in, i recommend magnaflow for this, and have your stock muffler taken off and a performance f body muffler welded in with tailpipes and your choice of tips, for the muffler i recommend the flowmaster 80 series 2.5" in dual 2.5" outlets;)

well the stock exhaust is not on my car anymore the person before me set it up different then stock so i want tyo redo it back to the stock way with performance exhaust. so what should i do? ty for all the help so far.