Nice! That was me last night. I read this thread and went out to my garage at 9:30pm to pull out the filter. The wife thought I was nuts, but I had to do it after reading this thread.
That is a great deal if everything checks out ok. Check CarProof, its' the better one for Canada as it checks all the provinces up here for accidents, liens, etc.
Pulled my HCF the other day. I also noticed an increase in throttle response. Time will tell if the mpg's go up. It was worth it just for the throttle response though.