prochamber or h pipe w/ stock mufflers?

here's the deal i ordered the prochamber for my 04 gt about 3 weeks ago, and the person i ordered it from is having trouble sending it they offered to send an h pipe with money back. ($80) i was planing on using the stock mufflers for now. should i wait for the prochamber is it that much better, or just take the h pipe? all input is weclomed thanks.