im going to be building up a 383 stroker, and the largest y-pipes i can find are 2.5 inch, which isnt large enough for me. im wondering if it will fit using 2.5 or 3 inch pipe off the headers, and i want to run 3.5 inch from the y-pipe merge all the way to the rear. im going to be using a moroso spiral flow race muffler in place of the car, it is a round design that is 4 inches tall. i dont plan on lowering the car much more than what the stock z28 suspension has sagged to. i am also going to have subframe connectors that are designed to clear the stock exhaust and floor boards.