Well ive just been in contact with "best mufflers" and i have calculated the sums and with prices off of there website i can have a full 3" system (parts only. Not welded) for $281.35. That includes 1x flange plate, 2m of mild steel piping, 1x flex bellows, 1x muffler, 1x 60 bend, 1x 30 bend 1x...