exhaust exhaust exhaust uggggggghhhh

Ok I have checked into some prices on exhaust ouch......This game aint for cheapy people..... So my Buid down the road has a set of flowmasters said I could have cheap..they are brand new hea says we will see.....I looked at my exhaust manifolds and there are super small....They look like 318 ones...I think I got in a hurry just to drive the darn thing and just threw on what ever fit at the the time.........SO I have a new questin....will the 95 and up or what ever year they are magnum style manifolds work on my e-body...he has a set of them too and they are nice aswell.....Left has to exit at the rear only and right has to dump in the middle only