the welding skills look good, but i would have gone with a more traditional 4-1 collector. the angles of cylinders 1 and 4 are coming in a little abrupt, but it should still make decent power.
i assume it will have a dump for an external wastegate as well.
I'm going to run the HKS 60mm. I was in the process of drilling out the hole for it as i took the picture.
How would you suggest running 1 and 4?