I priced one out this afternoon using a 4th gen F body Walker, single in, dual out transverse muffler. 4-45s, 2-90s, a 180, a 4' section of 2.5" pipe, and the muffler comes out to around $240 through Jegs. Of course you still need hangers, clamps, and tips. I'm going to see how much a local will bend a mid-pipe for before I go any further.