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.

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.