I wouldn't waste the money on ball bearing, thats not going to make much difference and is a huge price increase. The .48 A/R T3 side will spool nicely, though I would go with a T4 compressor with a 50-52mm inducer. You could go straight T-3 but the larger compressor will move more air and do it at a lower temp. You wont need 25psi to clean up the fuel for 150ish hp. 20 will probably do it. I'm running a .63 A/R hot side on my turbo, which makes it slightly soggy down at lower rpms but keeps the drive pressure down and I think is easier on the engine if your running it hard like I do. I can still make full boost by around 2500rpm though. Remember these engines don't like to make a bunch of boost down low with heavy fueling, they tend to bend rods, though at 150hp that shouldn't be an issue.
Jason
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