Thanks for the replies guys!! So the SC 3800 will like copper plugs better? Why is that? I'm curious because I have heard that before and I never knew the reason why. Also, should I go 1 heat range colder than stock? The highest grade fule that I can get is 91 octane, but I do 80% of my driving on highway/interstate. About the air filter, my engine is stock (save for a future K&N) and I did open up the airbox. I took out the white PVC? "wall" and then I cut a hole in the bottom of the airbox because there is a hole in the fender there. I DID notice quite a difference though!!
I was really suprised that it could make that much of a difference
Again, thanks for the replies!!