Actually, the mopar BOV spring can only hold up to 18 psi or so. Not the S3 26psi the srt-4's are getting which completely gets rid of the stock turbo and surge valve/BOV and replaces it with a new turbo and BOV and other components. PT's were only going to get S2(not anymore) with 18 psi max. The advantage of the Forge is the ability to run upwards of 20-22psi without leak. If you don't believe me, try capping your turbo's bottom outlet. That outlet is a bleed off back to intake. If you cap it your mopar unit will start popping open about 2800-3200rpm's with the part throttle boost. I know, I've tried it to get more boost, but it blew the mopar unit wide open!
