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I will agree that an intake elbow replacement will not make a huge difference in torque and hp. I have pointed this out a few times on other forums but no one seems to want to listen. The 6.7s run twice the gird heater area of late model 5.9s so they will flow more air even stock than the 5.9s. It is very easy to do some porting to a stock 6.7 intake elbow to help it flow a bit better. No one has posted how much better an aftermarket 6.7 manifold flows over stock or a ported manifold through the stock grid heater. The reason is that the difference is negligable IMO. The bottle neck is most likely the intake ports to the valves rather than the intake or grid heater. I have to laugh at the ignorance on many forums when it comes to CAIs and intake elbows for the 6.7s. The 5.9 guys have been making huge power and still using the stock grid heater and intake elbows which are HALF the size of a stock 6.7. From a purely performance point of view then yes these are areas of restriction but for most applications the stock intakes will still support larger turbos or compounds.
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Originally Posted by Speedy-J
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