Performance difference between carbs

[fastrthnu]

Id like to know what the perfomance advantages/disadvantages between these models. I was thinking about purchasing some D slide to see what they wher elike since Ive have both the others. I liked the reponse I got from flats. It would seem to me the resistance would be less with the round style. but more efficient fuel atomization, what a d slide does in comparison,... I dont know.