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the drag design will only allow a T3/T04B turbocharger since it positions the turbine further from the block than most other manifolds. because of this, clearance to the fans becomes a problem. Drag kits come with T3/T04B turbochargers in their Gen III kits, so i dont know what he's talking about.
plus, T3/T04B or any T3/T04 combination uses a standard T3, 4 bolt, rectangular mounting flange... any T3 turbine will fit if you have enough room in the engine bay.
as for turbine specs for power, i have my own "witch's brew" for combinations that suit the H22A... most are proprietary setups that work very well for their application.
for a topend turbocharger, a T3/T04B with a .60A/R compressor housing and -15 compressor wheel mated to a stage 3 turbine and a .83A/R turbine housing should produce some stunning top end results. you wont get a huge mid range punch, but you'll hit full boost at close to 4500rpm.
for something with a stock redline and more midrange punch, swap out the turbine and housing for a stage 2 with .63A/R housing... a bit more pressure from the smaller turbine housing will force the turbine to spool up faster, netting you full boost before 3500rpm... this is the setup I used for autocrossing, providing me with over 200whp at 4000rpm, excellent for dragging me out of the turns.
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