Turbo only allows Short Cast exhaust

Hi, sorry if this has already been reported, couldn't find it.
I went to build an engine, all fine, when I put a turbo on it, I found my exhaust options was limited to only Short Cast? I just updated to build 1003 from something like 199? Am happy to do a full re-install if it's one of those issues (if I knew how)
I also tried re-loading the engine, and selecting Cast Log first, before turbocharging, but it still reverted to Short Cast only. The issue also isn't related to year, I started at 2013, and moved down to 2001 with the same results.

I went to build an engine, all fine, when I put a turbo on it, I found my exhaust options was limited to only Short Cast? I just updated to build 1003 from something like 199? Am happy to do a full re-install if it's one of those issues (if I knew how)
I also tried re-loading the engine, and selecting Cast Log first, before turbocharging, but it still reverted to Short Cast only. The issue also isn't related to year, I started at 2013, and moved down to 2001 with the same results.
