I will be making some of these this spring, mandrel bent duct, and a K & N style cone filter (cleanable and re-useable) . Proll'y in the $100 to $120 range. You can also do what many do > also called the ghetto ram air kit on other forums I surf !
Home Depot pvc ends, cone air filter (U.S. made)> I've seen the $10.00 Chinese ones disintegrated into many intake manifolds
...and bingo NEW filter!
This one pictured , on our 2.0 makes a great induction sound-- and I've noticed that the revs don't drop as much between hi rpm shifts, compared to the oe filter.
Marty