I think I have $40 in mine. I went to a diesel shop and found a scrap 4" piece, plus a 4" - 45*. I used a 10" abrasive chop saw to cut a couple slivers out of the 45* and wire welded it all together. It's got a slight dog leg, but no bends and hangs on the factory hangars.
I put a 5"x10" tip on it and HATE it! Makes the sound louder, but higher pitched. It looks okay with the trailer on, but without it, from behind it looks whimpy cause it's so short. When I get a chance, I'm gonna make a 5" tip to go all the way back to the bend where the tailpipe comes down off the axle.