Personally I'd go for a Turbosmart kompact plumback. If you you have a vta it just puts the car into limp mode. All Mitsi and Scooby cars should run a recirc valve due to maf sensor. You could run a dual port but don't see the point in a 50/50 valve.
Running a vta won't put the car into limp mode.... But it will normally cause stalling issues. Some don't but most do. They can be adjusted to suit with a higher idle. Evo's do run better with a recirc tho.