IND and AMS point out that some of the components in the S63tu are not built with huge aftermarket power gains in mind. No surprise here as BMW just wants the car to last the warranty period so that means the lowest cost components that will suffice for this time period. AMS is not going further into what components they need to replace but obviously there will be a good amount of OEM parts that will not cut it for 1000+ horsepower.
Here are photos of the stock rods, pistons, rings, and wrist pins all of which will obviously be replaced with stronger aftermarket components:
Something interesting to note is that the top of the piston states N63/S63tu. The N63tu and S63tu both share the same compression ratio and with the markings on the piston it sure seems safe to come to the conclusion that the S63tu and N63tu pistons are the exact same thing to save BMW money. Easy to see why this is an area to upgrade with BMW sharing components with less powerful motors and cutting costs. Hey, welcome to the BMW turbo era.
That's it for now, we will all have to wait and see how this develops but considering the results AMS has achieved with the GT-R BimmerBoost certainly is confident the 1000+ hp goal will be reached... eventually.
Video of the M5 on the AMS dnyo below: