FYI,
So I had a free minute and I ended up doing the calculations based on what you said you have for fuel injectors, 19lb/hr units. The calculation estimates the level of hp the injectors are physically capable of supporting:
hp = (19lb/hr * 4 injectors * 0.8 duty cycle) / 0.5 BSFC = 121.6hp.
This is using 80% duty cycle, since injectors usually max out at 80%.
BSFC is typically 0.5 in a 4-valve/cyl BMW engine.
Even if I put 100% duty cycle (won't happen) for your so-called "match-flowed injectors", that yields:
(19lb/hr * 4 injectors * 1.0 duty cycle) / 0.5 BSFC = 152hp.
Even if I put 0.386 BSFC, which is ungodly efficient and a published number achieved by renowned tuner Pat Musi on a small-block Chevy 383ci, you get:
(19lb/hr * 4 injectors * 1.0 duty cycle) / 0.386 BSFC = 196.9hp.
Which is pretty close to your estimates...if you're saying you're on par with Pat Musi and your injectors operate at 100% duty. In addition, all these hp numbers are at the crankshaft, not rear wheel hp. So knock off another 17% or so drivetrain loss and you get 162.7hp at the rear wheels. Quite a far cry from 200rwhp...
If you can match these numbers, you better quit your day job and start up a Engine Tuning business.
Try Injector Sizing Yourself Constant