Difference between SMA and Edelbrock Headers?

[SOCRATES]

Greetings, All:

I've been frantically searching past posts regarding header choices, and I'm still quite confused.

Could someone tell me the difference between the SMA and Edelbrock headers? The Edelbrock are $500.00+ less than the SMA's, but do they perform the same? Any input on this?

Thanks in advance!

Black '04 H2 w/ Adventure & Luxury Packages. GOBI Ladder, Genuine Hummer Step and Driving Lights, Corsa on the way!