I did a typo there, I meant 4 cylinder and in the context of your own car... if my car was a 4 cylinder with 490nm I wouldn't be hating on it, that's just good!
I still don't see what your whinging about? For us honda boys as someone mentioned, we have things such as traction bars, reinforcement bars, etc.. you would be an idiot to not brace a car up with big power, S13 engine bays tear to pieces with coilovers ffs! Stop being a bitch thinking the U12 is crap, EVERY japanese car out there will tear, rip to sheds when you put an insane amount of stress on it, as I said earlier, 490nm of torque is fucking crazy!
Pull the engine out, seam weld the front area, brace up the area where the bolts are and you will be fine.
Just food for thought though.. I thought the KA's lean to the rear when under load? Hence trying to rip the engine mount up and out not down and out, so why in your picture of your subframe tearing at the front it has failed from falling out the bottom?