Hey mate,
Coilovers aren't illegal if ride height is above 100mm at lowest point.
Front mount intercooler is just an upgrade from factory front mount, so not illegal.
Forward facing plenum isn't illegal, but if you have a non covered pod filter, they can defect you for that.
You might get away with a 200cpi cat, but your statement suggests you don't have one at all. 400cpi is a better bet.
Not knowing what other modifications your car has, I can't speculate on other items you may be defected for, but to take a stab, you'd want to make sure your tyres have tread, your lights all work, and the cops didn't impound your car for doing burnouts. These are all factors not likely to work in your favour.