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i have a "drop in" K&N filter. i have only "noticed" a mere extra mile or two in gas mileage. power gains, if you read the literature about CAI will tell you "up to" what, 20 hp gains..??? i probably only get a mere 1 hp gain....if that at all.
but take into account the cost of a CAI over ANY amount of power gain, and the numbers just do not add up to the cost over say an ordinary drop in filter.
the only tried and true power gains one can achieve, is through engine modifications, such as pistons, intake manifold, headers, etc,etc, then too, unless one is racing, the cost is too much to bear for still what will amount to a small to medium power gain.
it takes more than just a CAI or drop in filter to increase power gains, bottom line.
one would be better served to just keep the engine in peak tune, use the proper oil viscosity and blend or full synthetics, not only for the engine oil, but the transmission fluids as well. it would be a complete and total waste of money to spend on the engine performance, and nothing on the transmission. once those wheels hit the ground, you lose valuable HP pushing that car if the transmission is using say gear lube (manual transmission) or ordinary ATF fluid, over full synthetics.
so in the end, unless you are willing to spend copious amounts of money for a full HP engine and transmission re-do, then you will NOT gain any higher HP ratings from a CAI...as stated, most are for the pure enjoyment of the sound, nothing else.
which then, one will NOT be satisfied about that noise, until he gets a different muffler as well....may sound like it goes fast, but nothing else for the cash outlaid for it all.
Last edited by Glenn8963; 12-05-2011 at 06:55 AM.