yeah the k+n or redline panel filters are just a sponge flavored version of your normal recangle filter found in your airbox. the sport better flow and in the case of k+n [not sure about redline] they have a serive oil which helps it catch dust. it just clips in onter the box and no one would know any different. helps the car breate a little better so although not by much you'll see a on the paper figure increase and a touch better fuel economy. the cai [cold air intake] helps get a nicer flow of air from under the front of the bonnect instead of in front of the headlight. again the "forced air" from normal driving [or high speed] will push air into the works again assiting in breathing and also its more direct [so say your night driving you get a good stream of cool air from just under your bonnet rather than some mucked up turbulent stuff from behind the headlight.
two ways to do a CAI, grabbing the intake and funnel is needed and from there you can either make the intake hole on your stock box bigger or buy a supercharged filter box [bottom half only needed] for a bolt on clean finish. [less leakage too. unless you salastic or seal a cut box around the funnel.] but yeah that and a sports exhaust are two nice small mods to make the car sound a little better and breathe more freely. which can only be a good thing.
