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The air filter in this car is very over sized for an engine this small, think its double the size of the one in my 3800 v6. I swapped out my air filter at 35K and 60K at the same time as my cabin filter, but it was not necessary. figured I had the air box apart to check it might as well put in the new one.

GM recommends 45K air filter maintenance, which may even be low for some considering what the filter looked like at 30-35K in my car.

 

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Only problem with testing different filters with this is it would not really tell you anything useful. What I mean is we know a stock air filters filtration is far superior to a K&N, which means the K&N would always show less vacuum since its always less restrictive. K&N even claimed in the past their filters flowed more air dirty than a stock paper filter did brand new, can assume this claim could easily be seen with this installed.

Just remember this is only going to measure how restrictive the filter is, not how well it filters the air because of it.

Blue Angel, before you swap out to a new filter I would love for you to test removing the foam pre-filter from the stock filter. I did this last summer on my previous air filter and it really seemed to gain allot of power for such a simple change. Guessing it would lower the vacuum to some measurable degree.