Go with the stock wrx hood splitter and duct work. I have one on mine and have the usdm wrx engine with stock intercooler and it works perfect. It just bolts up where the stock solid cover was on my 99 2.5rs. Subaruparts.com has the full setup for like $60 bucks not including shipping. Try this link: http://www.subaruparts.com/diag/?mod...category=910-1
. Cut and past on your browser. Hope this helps, you may have to use the Sti setup, not sure if the Sti I/C is any taller than the wrx I/C. Call Subaruparts.com and compare the parts for the two.