Im new to the induction scene, but i have a hard time believing that modern turbocharged engines are suffuring from an improper cylinder fill. When your talking about flow (induction) helping engine performance (other than the design of the manifold) you are refering to the fact that the cylinder is not receiving enough air (do not confuse with density which is more related to tempature). Remember that the purpose of a turbo is to pressurize the intake a.k.a. "it's deVfinently suckin" (best impersonation of the gti girl....i know it sucks thats my point). I guess what im saying is that when your dealing with bolt-on intake performance tempature is more of an issue with the stock box than induction, although i do believe stock filters are the flaw in stock application. Ok now that ive said all this i must state that im new to the tuning market and have no real data to back up my statements these are just theories based on the little knowledge i have on na engine behavior. Please dont take threat to this post none is intendid. I would also like feedback if my statement is in anyway wrong or misleading.