GN1 headers are probably the most affordable “good” headers. I used them on a budget build (turbo station wagon) and they’ve been great. Have a few thousand miles on them now, and the car made 532WWHP with the GN1’s.
I have a set of ATR stainless headers & ATR 3" stainless downpipe ( internal wastegate ). I'm running ATR headers and these headers were a spare set I picked up a while ago and never used them . I was using the ATR downpipe until I put in my new motor and switched to a 3.5" and an external wastegate . The downpipe is SwainTech ceramic coated .