Hey guys, I searched the fourms and couldnt find anything to answer my question so apoligies for the re-post if so. Anyways, I just installed a K&N Aircharger about a month ago...honestly no real huge gains anywhere, throttle response is a little better, exhaust is slightly louder and gas mileage has dropped it seems...I have a 2008 gt. The car has 15,800km (9,875mi)on it so no issues with the car runs great, running 87 gas only mods i have are the cai and muffler deletes. First tank of gas with the cai installed i obviously ran the snot out of it lol and got 274km to that tank with purley city driving. this last tank i just did i got 255km to the tank and i was constantly driving conservativley with gas mileage in mind to see what kind of gain id get with the cai and there was no gain...highest mileage with city driving iv got was 312km to a tank and that was back in Feb with the stock air box, is the cai garbage/broken? Anything i can to to fix??