I have a brand new (never used) 3in ATR Down Pipe for ATR Stage II Headers. Its been Jet-Hot Black, 2000 degree coated. It has a dump tube for a tial 46 Waste gate.
This downpipe was made by ATR. It fits Buick GN/T-types with Stage II heads with ATR Stage II headers.
If you have a Turbonetics Racegate on you ATR Stage II headers you will need to change the flange on the Downpipe.
Let me know if you need any pix. I should have some by tomarrow.
Chris