I've had a 3 pc Mac Prochamber for over a year now and bought a slightly used 3 pc Mac H pipe from a friend. I just wanted to try out the H sound for comparison. Since Mac changed to a 3 pc interchangeable design, it only took eight nuts to swap the chamber for the H section. I didn't have to mess with the legs that mate up to the exhaust manifold.
I can say from personal experience that the H is louder than the Prochamber. It is also a little higher pitch. The Prochamber gives off a deeper rumble. The H also sounds a little more raspy right at 2500 RPM. Another way to describe it is if the Prochamber gave off a vrrrrooom sound, the H gives off the same vrrrrooom sound but it rolls the r's. If you've listened to a Hispanic person talk, you'll know what I mean by rolling the r's.
I don't have any comments on track times or dyno runs between the two. There have been many magazine articles that made these comparisons already. The Mac Prochamber, Mac H, other H pipes and other X pipes have all been within 1-5 rwhp of each other. That's well within the noise level of the dynos I've been on.
I can say from personal experience that the H is louder than the Prochamber. It is also a little higher pitch. The Prochamber gives off a deeper rumble. The H also sounds a little more raspy right at 2500 RPM. Another way to describe it is if the Prochamber gave off a vrrrrooom sound, the H gives off the same vrrrrooom sound but it rolls the r's. If you've listened to a Hispanic person talk, you'll know what I mean by rolling the r's.
I don't have any comments on track times or dyno runs between the two. There have been many magazine articles that made these comparisons already. The Mac Prochamber, Mac H, other H pipes and other X pipes have all been within 1-5 rwhp of each other. That's well within the noise level of the dynos I've been on.
