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Stock air box vs. K+N CAI

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Old 03-27-2020, 07:58 PM
  #61  
40th steve
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Originally Posted by hatchetf15
40th Steve - Reference Streather, the difference between the 3.6/M96.05 and 3.8/M97.01 boxes, other than the plate, was the 3.8 box had a vacuum resonance flap installed. Air flow-wise, I’m not sure. Both 997 boxes are more air tight (keeps intake air cooler) than the older M96 box and visually look to have more interior volume.
Thanks, I have a 997 3.6 airbox installed so just wondered what the difference was and if there was any benefit with the 3.8 over the 3.6 one. I quite like having the correct engine size on the top of the 997 airbox but if the 3.8 lower section is an improvement could it be fitted to the 3.6 upper?
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Old 03-27-2020, 08:35 PM
  #62  
hatchetf15
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95% certain it will fit. Only change for 3.8 is a vacuum flapper valve not used by 996 engines anyway. I don’t know of any empirical data to support improvements for one over the other. I also like having the correct displacement displayed.
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Old 03-28-2020, 01:11 AM
  #63  
pdxmotorhead
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Originally Posted by AnthonyGS
If the filter is a restriction you get a bigger filter. 800 hp 9k rpm small blocks run just fine on Wix paper.
until they get wet.. LOL adn on a sprint everthing gets wet .. Almost takes longer to clean the dang thing than swap the engine.
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Old 03-28-2020, 11:02 AM
  #64  
808Bill
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Originally Posted by Mike_A
not only that^^^, but it frees up a lot of space back there
That's why I put mine back on. It really helped to find a couple of oil leaks that I could not see with the stock box on. I now have them fixed and back to the factory box.
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