well a B23FT stock is 160hp,
basic tuning such as removing the Cat and freeing the restrictions in the exhaust, plus a fiddle with the boost gives 190-210hp
next a trick cam, better valve springs, re-timing and another hungry increase in boost pressure gives a sensible 260hp
find a 16v head plus a new exhaust manifold from a 1990's onward can give an extra ~10hp nick that from a b230 mind, changing this allows for a bigger turbo T04/T3 hybrid, then an increase on fuel pressure and chip the ECU you're now in the region of 320hp
At this point the stock injectors cant deliver enough fuel for over 320hp, so go big or go home, get the head gas flowed and oversize the valves as well as giving the manifolds a polish and you should be good for 400hp+
If you want more, then get the bottom end balanced and blueprinted, align the crank and block plus a stroker kit.
At this point just turn the boost up and see what it makes, the following will kick out a reliable 400hp+, I've seen them from 500-700hp
I think the Saab lump and Volvo B23FT are in the same league as each other, big power with not a lot of replacement parts required.
Its not about horse power, it's all about the buckets of torque, the odd thing is most 500hp B23FT put out about the same figure in torque, most in excess of 550 ft-lbs
YouTube- Volvo 740 2.3ccm 16V Turbo 530hp 700+Nm
watch and enjoy
basic tuning such as removing the Cat and freeing the restrictions in the exhaust, plus a fiddle with the boost gives 190-210hp
next a trick cam, better valve springs, re-timing and another hungry increase in boost pressure gives a sensible 260hp
find a 16v head plus a new exhaust manifold from a 1990's onward can give an extra ~10hp nick that from a b230 mind, changing this allows for a bigger turbo T04/T3 hybrid, then an increase on fuel pressure and chip the ECU you're now in the region of 320hp
At this point the stock injectors cant deliver enough fuel for over 320hp, so go big or go home, get the head gas flowed and oversize the valves as well as giving the manifolds a polish and you should be good for 400hp+
If you want more, then get the bottom end balanced and blueprinted, align the crank and block plus a stroker kit.
At this point just turn the boost up and see what it makes, the following will kick out a reliable 400hp+, I've seen them from 500-700hp
I think the Saab lump and Volvo B23FT are in the same league as each other, big power with not a lot of replacement parts required.
Its not about horse power, it's all about the buckets of torque, the odd thing is most 500hp B23FT put out about the same figure in torque, most in excess of 550 ft-lbs
YouTube- Volvo 740 2.3ccm 16V Turbo 530hp 700+Nm
watch and enjoy
) Will hopefully show you what the plan is soon 
