Will all aftermarket turbos (that aren't bolt on) require a custom licp and downpipe? It seems that way as turbo kits come with them. My question then becomes: are the LICP that come "Bolt on" with the rest of the stock application, and what to do about say, having a HPF 3.5" TBE but then being forced to go with a 3" DP that bolts up to the kit.

Do you think companies like AMS/Buschur would fab up a larger diameter dp if needed?

Also, how do the aftermarket turbo LICPS compare to standard aftermarket (Stock turbo) LICPS as well as the o2 housings that come with some kits.