jpsjr70 , here what I got so far.
Downpipe, I will need a car to do a prototype, but in a glance, it looks similar to F10/F12 M5/M6.
Tip wise, based on this picture.
Looks like the tip is held by a rivet. If it will come off after you remove the rivet, then there will be plenty of options.
If anyone local to me willing to do this, I can work something out.
