Im gonna bet that when you put that on there is gonna be a ton of interior resonance and drone. The pipes in MACs PC are angled towards the opposite exit hole slightly. You have zero guidance for the air, and there will be exhaust just "swirl" in areas before it leaves. Im interested in hearing it, but there is a reason that people dont just make your "prochamber" design and sell them to all their friends, not exactly as easy as you made it.