Well, im considering a another 300zx project. I do NOT believe the flow of the 2.5" splits will outflow a straight 3". From my years of experience on this forum i know exactly what people are going to say, "Look at the dyno charts on their website." Yes, its called marketing, and it worked. No one else has able to produce any valuable comparison between the two. I guess it never will since now they do have a superior product (3" Splits) and their 2.5" split style has dominated the market.