Those pistons and rods will handle anything you can throw at them, they are extremely chunky..
I reckon other parts such as crank, gaskets etc would go before these items would give way..
The pistons lower the compression to 8.2:1. I have ran 20.7psi boost peak with all this gear, and no problems whatsoever. And consistently running 17psi every day. So if you were thinking of running more than 20psi, you be making some pretty serious power, but I think the pistons would still be fine etc. And then you would still be making in excess of 150kw at the wheels. I think the pistons and rods would happily see 200kw at the wheels assuming you had a strong enough drivetrain, crank and other stuff to support it.
Mulholland overseas make race cranks that rev out to 10,000RPM. I think you couldn't do anything more to enhance these pistons and rods..
White Knight has these pistons and rods, so does my car. Not sure if any other cars have used them yet, but the pistons are actually made by SPS pistons in Australia who have a top reputation for making pistons for almost all vehicles.. The rods are made by PAR who make stuff for heaps of high performance stuff, they are again one of the best names in the business. They are EXTREMELY oversized for the micra, ultra strong. Not recommended for NA micra engines because they will add a bit of extra weight and you don't need such strength for NA. Datrats just re-sells them.
I can also highly recommend the Datrats clutches. Errol is highly onto the clutch scene, and has the best options for micra heavy duty clutches available and for superb prices. My clutch in blue monster isn't worth a lot, and it NEVER slips with up around 150kw at the wheels running through it. Highly impressed with it.
Errol's flywheels are great also. I think thicker in volume of metal than the JUNs and Errol reckons that this will make them less vulnerable to overheating which I have found to be a potential problem with the JUNs when you stuff up a gear change or launch big time and let the full power of the engine go through the clutch accidentally.. But Errol reckons the Datrats ones would be better than the JUN in this respect because the JUN is quite thin. But an awesome flywheel apart from that.
Every since my big full engine rebuild with all this gear, I can honestly say, the internals of the engine have always felt 100% rock solid ultra reliable and happy every time I drive the car. It feels like I can trust the engine, no dodgy noises, superb smooth power delivery, I never get any blow by in my car either, I think the engine is just sweet as. I'm not sure which piston rings they used, but it was actually a very sweet job. Now I am confident at throwing whatever boost at it and knowing it won't snap on me. I am always more worried about the gearbox..