Hey just for those of you, who do not want to add a cold air intake to your nismo's, I just added the K&N drop in filters to mine today and I think they are great and the install was very easy just take off the brace in front six bolts two different sizes drop in new filters .....there you go may add HP and sound a little better but just fun to do ....looked all over for best deal they are sold everywhere for 79.00 you need two but Autozone has them for 59.00 hope this might help.....

 

Yup, I have them too. I guess the install was easy compared to CAIs, but damn was that a lot of work just for drop in filters! Not sure if I really feel any gains though.