I bought a airaid stage 2 a few months ago... and just instaled it ,all I can say is WOW !!!!!! I went from 14 to 15 pounds of boost to 19 to 20 pounds of boost !!! with no chip on my truck I thought something was wrong with my gauges ......... nope they work good you can here the turbo now under the hood sounds sweet ! and feel the difference especially at the higher speeds like when it hits 3 gear it takes off now !! I would tell everyone that this is well worth the money no questions asked !! I have a friend that has the diy air-filter and mine is way better IMO and my buddy thinks so too .. the next thing he is doing is putting a airaid stage 2 on his truck ..