Its for a 97 GSR...

Whats the power difference in....lets say a DC SPORTS (cuz of popularity) their 4-2-1, 1 piece compared to their 4-2-1, 2 piece, compared to their 4-1, 1 piece.
Also, any difference in the 2 different materials they use? One is stainless i believe, the other being ceramic. Any other random info about these would be nice as well )