Originally Posted by gregsdart
My best pull was with the shops dyno headers, 2 1/4 primarys and if i recall a bit long. My 2 1/8 x 30 were down about 7 hp up top rpm.
...
If I do ever get a set of 572/13 heads, my goal will be 1,000 to 1,025 hp. So I hope 2 1/8 to 2 1/4 step headers will be best, and what ever collecter is going to pull best in the mid range or overall.

I like the way you are thinking. Even if the stepped headers ended up down 5 hp at peak, if they gain enough at the converter speed (shift recovery) they may ET better.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1