Here is my 13.5t Yokomo YZ-4SF carpet setup from PDX RC Underground and the Rockstar Series.
After IOCC I decided to start over and make a fresh setup. Working with a lot of changes I have never tried before.
The car is amazing, lands well and is very quick. I suspect the setup would work quite well in mod but I have not tried it with a 5.0t yet.
I understand that Yatabe springs have become hard to fine, and though I think the car is best on these Yokomo springs, its not bad on AE orange front and AE blue rears.