I don’t know how relevant it is these days but one of the old cheap mods was making a custom intake tube from the CAIs made for civics that were stocked at a lot of auto parts stores and reconfigure the couplers/ breather ports for the Tbird layout. Could also probably just make the same thing with any 2-1/2” or 3 pipe with a 45° bend and some universal couplers grommets and flex pipe. That’s what the “RichardM tube” was if you ever see it mentioned.
Don’t expect any kind of performance improvement though, out of curiosity what broke on the stock violin case?