About 2 weeks ago I put a K&N airfilter in to my SRT-4, The model E-1006 that was originally made for the 2.0 engine. When I put it in I noticed that it was a bit smaller than the original. Last night I dragged my buddy who also has a completely stock, including airfilter, SRT-4. We have the same milage, but I had a friend in my car who weighed about 210lbs. My friends SRT pulled mine about 4 car lengths to 100mph. Now I have been taking it fairly easy on mine, getting on it once in a while,...but raggs his out big time. So what gives? When I am getting on mine, I can hear alot more air rushing in to the air box than before, is the K&N filter actually slowing down air flow because its a bit smaller? We dragged twice, and he beat me twicw pretty well.