Be carefull when slapping turbo on an EJ25 N/A. The reason I didn't put a turbo on my RS is because of the compression ratio, 10:0.1. Also the heads on that motor are not very strong. But if you do want to turbo the Forester I would get the Apex-i AVC-R boost controller and run no more than 6 Psi. With the compression that you have, at 6 psi. you will be at around 310 crank Hp. and about 260 Whp. I would Suggest beefing up the transmission with a STi RA gear set ( about $1,500 but worth it ). Let me find my old list of the Ej25 turbo setup.How much money do you have to spend on the biuld up?