I just recently ordered a ebay downpipe and when I bolt it on to see if it would bolt up to my o2 housing, it did, but doesn't match up perfectly. Just thought I post it up and see if you guys think it would cause any problems.
This is for a 2g gst, 2.5 from o2 to 3 inch ebay downpipe, it'll be bolted onto the e3 16g as seen in the pictures.