Ed, I looked into doing it and my race shop Subie guys kept telling me, we can do it but for what it's worth let us do a turbo set up and you'll have oodles of power for a lot less. I think Marty has a good set up with around 240hp and a bit less, turbo lag, kick making it a bit more N/A like ...
if you could do a 3.0L subie 6 it would be 50lbs more but then you save 50lbs in turbo, intercoolers etc etc... it would be a bomb as it give about 240 n/a
EZ30D: 2999CC DOHC, 245ps (180 kW) @6600 rpm, 297Nm@4200 rpm. Bore 89.2 mm, Stroke 80 mm. Compression 10.7:1. This version had three exhaust ports per head, a drive-by-wire throttle, a black plastic intake manifold, VVL and AVCS. It was available in manual and automatic unlike the old EZ30D. Found in the 2003–2009 Legacy 3.0R, Outback 3.0R and 2006–2007 Tribeca Engine horsepower reported as 250 hp, in Subaru of America publications in 2005. It made its debut in the 2005 USDM model year.