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Stock Filter VS K&N Air Filter (Run 11)

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Figure 4, Stock Filter VS K&N Air Filter (Run011)

• Parameters: Run007
  Stock air filter with approx. 15 k miles on it
  Timing at 30 degrees full advance at 6 k RPM
  Sunoco Ultra, 94 octane
  
• Parameters: Run011
  K&N Filter approx. with 2K miles on it.
  Timing at 30 degrees full advance at 6 k RPM
  Sunoco Ultra, 94 octane
  
• Conclusions: This run indicated good agreement at lower RPMs and a slight increase (less than 1HP) in falloff of power beyond 8K RPM. We could not demonstrate to my satisfaction any performance improvements using the K&N filter that I feel would be statistically significant. Since the results of the stock filter vs. no filter indicate that the stock filter is not a restrictive element in the intake tract, it would be hard to believe any alternative filter could improve the output of the engine. Unless you consider the reusable aspect of the K&N filter as significant, I do not believe it is a worthwhile investment.
• DynoMain