Originally Posted by NSFW
I'm hoping someone makes a TS exhaust housing that mates with OEM TS up-pipes and USDM single-scroll down-pipes.
For the size of turbo I'm looking for (3076 or bigger) the OEM JDM exhaust housings are going to be too small to be useful, so it's going to take something custom - and if it's going to be custom it might as well mate up with all of the downpipes that the entire US market is using. The twin-scroll headers and up-pipes are going to be a big enough barrier to entry in the first place, it makes good business sense to let customers re-use the downpipes we have, and/or use readily available, proven, relatively inexpensive USDM-style downpipes.
Actually the JDM Downpipe is larger than the USDM, because it uses a larger waste gate flapper. Unless I am missing something or not quite understanding what you are asking, using the USDM style just isn't going to work.