T3 turbo flange ~$25 shipped
Oil line kit ~$35 shipped
Used turbos can be had for $150 shipped, some find them for less, I havent paid more than $120shipped for a turbo off ebay and I have bought many. New 450whp+ turbos can be had on ebay for less than $300 shipped.
Fabbing turbo exhaust can be compared directly to the amount of money and effort behind a cheap set of headers... buying your turbo pipe is compared to buying premium headers.