I installed the drop in.....my gas mileage sucked.....it really got worse. I contacted K&N and they said to diconnect the neg battery cable for a half hour to reset the comp and then drive for 100 miles so that it can relearn your driving style. The gas mileage got better after that to where it was before. I didn't notice any HP gain.....I think that I will stick with the paper filter, my brother's car failed the emissions test after he installed a K&N air filter...it gummed up the throttle body.

 

My gibson exits on the passenger side only. Perfect for blowing past old/slow people in convertibles. I actually scared a horse that was sticking its head out the window of a horse trailer when I kicked it down to pass one time, oops.