Love that
I'm the same a Ekona if I need it I get it or save until I can - I try not to use the card unless it's really important - insurance or something as that just buggers you up for the next month when you have to pay it back
Its the design the ball joint is pressed in at manufacture and can not be removed without damaging the arm itself. The bush is a push fit but you will need a proper press 10 ton or bigger to "push" it in/out .
Depends on the supporting mods and the tune - anything from 350 at the wheel and up mine was running over 450 at the wheels on this kit but I have a LOT of other stuff including a built engine!