Tin,
You'll notice the order in this one differs from the first picture, they are built for two different motors, the first one was a BBC, these headers are built for a Clevo. Yes the builders of the 8 into 1 systems seem to put them into some sort of order, but I have never had it explained to me what the criteria is.
The 180 degree systems sound smoother than a typical exhaust, but they still have that low frequency "cross plane crankshaft" V8 rumble. The 8 into 1 systems loose the rumble altogether, they have that Formula 1 or Ferrari whine, like they have a "flat plane" crankshaft.
The 180 headers are supposed to be worth 15 to 30 horsepower in an unmuffled race engine compared to a standard set of headers. I've never heard how much gain (if any) the 8 into 1 systems provide.
![[linked image]](http://i61.photobucket.com/albums/h51/gp_fillmore/Technical%20Images/180headers.jpg)
-G
![[linked image]](http://i61.photobucket.com/albums/h51/gp_fillmore/Pantera%20International%20Car%20Club/rhino.jpg)