Those offsets are not s-chassis friendly (i'm guessing that's what you're driving). The rears would be fine but the fronts will most likely need a spacer to clear your suspension.
compared to the stock average est of 120whp that a 5spd ka provides w\ four cylinders and only 2.4L of displacement. When you make 450whp which is about 375% more power, same displacement. **** will break. no doubt.