So after two sets of flanges and clamps, I think I got it right. I Bought the 2.5" 4-Bolt to 3" V-band adapter from HimNi Racing, and strapped it to my 16g.
I bought a OBX 3" inch Civic V-Band downpipe, but the two flanges didnt match up...
I tried to tighten the clamp down as tight as possible, but the seal wasn't a seal at all. So, I hoped on the internet (budget EBAY build FTW), bought a whole new set off flanges and a clamp.
When the flange came in, I test fitted it, and it was perfect! :boobies: The next day I called the exhaust shop and got the new flange welded on the downpipe.
I torqued down the turbo and wastgeate, and fastened the downpipe...
Weld work done by Paul at Paul's Custom Exhaust.
...And with the flick of a wrist...
Everything seals flushly ans snugly, and it's a beauty to look at.