I switched to the Bosch Gen3 injectors for my 328Ci when I upped the boost this past year, and had the old injectors sent out for cleaning and blueprinting.I sent one of tthe spare new models to have it flow compared, and while the original injectors were all functioning to at least 98.7 percent, the new ones are truly a leap forward.
I had the car tuned with the injectors only first, no other changes (same 14.5psi, etc), and the tuner, who is widely regarded as one of the absolute best in the country, was able to get an extra 28rwhp and 31rwtq (min torque gain was 18lb-ft!) just from the resulting effects of the worlds better atomization. AFR deviation was cut to 1/3rd of what it was, cylinder temp decreased, and charge air temp dropped a further 25F strapped to the rollers.
I am putting some in my E46 M3 to work in tandem with the CSL intake, aggressive cams, etc, and preliminary testing has shown a gain, in a very high strung NA motor, of 11-16rwhp (final tune should be another 50pct more).
Idle quality is better, power is smoother and more responsive, torque curve is flatter, and in my 328Ci I went from 25mpg Highway to 28.9mpg, and this is a race motor.
I run RL SI-1 regularly, but for anyone who is not using the troubled DI setup, I cannot recommend swapping to these injectors highly enough! I have been building and tuning cars a long time, and I have never once seen a product that improves every singleaaspect of an engine, until now. The cost is not bad, a few hundred, but just look them up to see for yourself...
As for MMO, I have never seen any benefit, especially when I have yet to see any wear even on the cams in my race motor. Run the best oil for your application, never cheap out on gasoline, avoid ethanol, add SI-1 every few k miles, don't let the empty light come on, and change the fuel filter more often than you think you should.