toe in will eat your rubber faster than camber or doing burnout.
if you are not lowered more than 2inch, you are wasting your money for camber kit. I'm assumping that p5 doesnt have a camber adjustment on stock suspension.
everytime you change the shocks/springs you'll need alignment done, 4four wheel alignment.
like when you lowered the car, let the new spring/shock settle, i would say put about 2 week of driving on the new parts so they would settle.
then get an alignment.
btw i just got my alignment done today..cost me 55dollar without those discount fryer..dont forget to ask for a spec sheet for the before and after alignment spec