At this point really your only options are getting second hand aftermarket japanese pipes, or getting something custom made.

Keep in mind if you change the spool characteristics of the TT’s too much, its possible to run in to code 66. But my advice here is send it, and cross ya fingers/deal with it if it does pop up.

Good news is it turns out you can run sequential TT now on a Link ECU, thanks to yours truly pesting the engineers there. We just need to validate it on a few cars. For now it’ll just come in the form of a tweaked base map, and instructions on how to wire it. In future i hope to get it implemented as a feature. (I work at Link now btw lol, didn’t take me long to get TT going lol).