Originally Posted by grizz1

Hi pantera nitro, It's Retro's #1 convert here

Adrian started using that combo on his 7 Port. The 2047 is a wicked mid to top end pipe, but it just lacked a little bottom with the 7 Port. Putting the longer 0801 header on the 2047 pipe gave nice bottom end punch with a smooth transition right through to a screaming top end.
I have run this combo on both my 7 Port and my modded 5 Port and it rocks
The standard 0801 seems to give good bottom and mid, but it runs out of legs a little at the top on the 7 and 5 Ports (cant comment on the 3 Port as I haven't run one in competition).
Basically the hybrid 2047/0801 combo gives good power everywhere in the rev range and is smooth to drive.
We have been calling it the working man's 2072

It sounds like the 2072 is very much like this hybrid set up, with the bonus that the new bigger volume chamber on it makes more power overall as well.
Can't wait to try one out