9b's wouldnt be the way to go unless you like turbos that spool at idle imho 14b's would do nicely and give you plenty of room should you need it. But if you go the 9b route 300 would be possible on 10-12 pounds.

 

14b's won't give him torque peak until quite a bit later than what he is looking for due to the slow spool. 1.25 liters per turbo will make them pretty lazy especially with the reduced compression and lesser head flow as compared to a 4g63 or Honda.

 

garett t3's .48 turbine you pick the compressor wheels (I'd say 46 trim or so).................... the 9:1 compression is fine, why go throught all the expense to lower it .5 of a point, put the money in a clutch, a gear depandant EBC, or somthing fancy that'll actually help it be consistant.

 

Use 2 TD04-13T's off of WRX's. 6CM^3 exhaust housing like the larger TD05-14B, and the compressor flows between the 15G and 14B. As far as what was used in the past by Callaway, who cares, there's better turbos out there now

 

You guys are too used to tuning late model crapola.. The kind of things that can run on pump gas at or above 10:1 CR and produce almost 100 hp per liter in NA form.

I'm running an 8 vavle 2.4L POS (22re) - stock might have dyno'd 90 at the rear wheels. 9.4:1 CR and advancing the timing a few degrees it would ping on pump gas. My guess is that his Alpha is more along the lines of what I'm running than a modern 16 valve'r with VVT.

If he's got an old school alpha and wants 300 hp out of it, he'll need to drop the CR to crank a bit of boost. It's a trade off.
Also, remember if he's going for a peak of 300hp, he needs two turbos that are efficient probably around a pressure ratio of 2 and sustain airflow for 150 hp (if doing twins).. Them is small turbos. The turbos should be efficient at that point..