rx7speed, what part of post #47 don't you understand? First of all, nothing about the exhaust on your RX7 is applicable because you have a rotary engine, and the Prochamber is specifically designed to utilize the impulse pattern of a V8- which as you so eloquently put it in another thread goes boink boink boink while a rotary goes vroooom. While it sounds kindof derogatory, it was a pretty accurate comparrison. Apples and oranges.
Like a turbo, the ProChamber makes more HP be scavenging exhaust gasses and creating a boost in velosity by harnessing the waisted heat energy that would otherwise be going out the tailpipes. Actually, it works nothing like a turbo, but I'm running out of ways to explain this. The amount of exhaust is the same, but the intervals that it exits each side are uneven. H and X pipes are designed to advertisedly "allow" pulses to cross. In actuallity, only an H pipe allows it, an X pipe forces them to- giving them no choice of where or how hard. The ProChamber, as I said earlier, allows exhaust gasses to see both outlets at once from an environment where they are allowed to equalize while getting hotter which forces and increase in velosity.
To clear up the Y pipe issue- they typically try to take exhaust from two small pipes and feed them into one pipe of the same or only slightly larger one, which creats a bottlneck and backpressure effect. Again, nothing like a ProChamber, which has a stable pipe size throughout and doesn't squeeze the flow anywhere but on the contrary, gives it extra room in the middle.
The original X pipe, the Doctor Gas, outperformed the other X pipes for years. Look closely at it and see that it isn't a true X, there is a round chamber in the middle. Go figure?! It remained the best until Bassini out gunned it on the dyno. Look closely- overall it's an X, but while the pipe is a steady 2.5" throughout, where they cross is- imagine that!- much larger, almost like a... a... chamber! Hmm...
The simple reason you see testimonies of people dropping H's for Pro's and not X's for them is that Most stock Stangs come with an H already. When you just spen a couple hundred dollars on an X pipe to give you 10HP over stock, most people aren't stupid enough to pay another couple hundred on another pipe that may only give them two more than what they have. It just isn't worth it.
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