If you want to have a stock Pefal Feel, You can use the Stock PP with the new disc. It all depends on how much you can deal with a heavy pedal. I've felt a ACT stage 4 in a Miaita 1.6L. And i would NOT recommend it for a DD. It'll hurt you, and the cars performance.

Now if you were to get 300HP in a day or so, then i would definitly say throw it in..