I chose to custom fab most of the exhaust this time on my car for a few reasons. One reason that I wanted to custom fabricate the exhaust was because I can!=Þ Secondly, I wanted to fabricate it myself becuase I wanted to save money. I chose to custom fabricate a SS O2 housing, 2.5" downpipe, and 3" Thermal Exhaust to finish off the install. Here is a list of parts:
Turbo Flange from RRE
3 - 2.5" flanges for the downpipe and O2 housing from RRE
O2 bung from RRE
1 3/4" mandrel bent ubend 16g from Summit
2.5" donut 16g from "The Chassis Shop"
4' of 2.5" straight tubing 16g from Summit
SS flex section from RRE
2.5" - 3" radius 16g ubend from Summit

To fabricate the downpipe on a 2g AWD it is relatively simple. First you start with the flange and weld it onto a short 6-8" piece of pipe. Onto that piece of pipe I then welded the SS flex section. The remaining part of the 4' pipe was welded onto the SS flex section for the final run of the DP. Next I bolted up the flange to the O2 housing and cut the 2.5" ubend in half. I sized it up so the end of the ubend would be even with the exhaust. I finally cut the ubend to the right angle for the straight pipe and tack welded them. Here is the final result:

The Next thing I fabricated for my exhaust was a SS O2 housing. This will allow the turbo and engine to breathe much easier. This is relatively simple as all you really need to do is build a Jig for the O2 housing. I made mine out of 3/4" high-grade plywood. This will allow you to bolt up both flanges and merely cut the donut so it fits inbetween the flanges. After it fits between the flanges all you need to do is run a bead around the pipes to fill attach them. I also welded a 1 3/4" dump tube that is externally vented to also aid in engine and turbo performance.

Finally I bolted up a standard 3" Thermal Research and Development Cat back exhaust system. Straight forward install and looks great.