Would the TTi 2inch to 2 1/8 inch step header be too much restriction on the 572?

That is what i am running and am going to start with that on my new 540 Bullet...

They fit good with the torsion bars.

Arnie

67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...) 70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.