I would never argue against hard core evidence. That would be stupid. What I'm saying is that I have not seen any evidence where an entry level PD blower has done any of this against an entry level centri blower on a similarly equipped car or on 2 otherwise stock cars. And you also have to realize that its how you build the car. If you just go about slapping parts on something and then throw a centri blower on top, then yea you will get taken out. But if you know your stuff and know how to build a car so that each part compliments the next, then I'd put my money on a centri blower kicking ass. Especially in an environment where top end is essential. Now if you're comparing a Whipple 3.4 to a Vortech T-Trim, then that just isn't fair. I'm talking same level PD vs same level centri on 2 similar cars.