Quote:

I agree with Greg. With 572 inches a 2 1/4 will fit the bill. I run 2-1/8 stepped to 2-1/4 with 557 inches. They seem to be about right for my combo.

x2
Keep them short (30-32") and a 4" collector should be good.

My little 511 CID has 2-1/8" x 32 headers.

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