i have a k&n stock replacement filter right now on my 97 es3. which one would be better for performance? better for gas mileage? anything else i should consider if i keep the k&n? or should i even go with a cold air intake? forced induction or natural aspiration? any specific type of piping? or heat shield? all help would be appreciated

-hoebag

 

I have an '02 ES (1MZ-FE). The stock Denso filter and the K&N match on performance (ie acceleration, etc). Simply stated you won't get any performance enchancements from switching to the K&N filter in the oem stock air box.

I cannot speak to changing to a different air delivery system such as a short pipe, cold pipe, ram, etc.

MPG
The big difference I found with switching to the K&N, I picked up 3 mpg on city/round town driving and close to 5 mpg on all out highway driving.

save $$$ on filter replacement
I never have to buy another filter again. At approximately $12-30
depending on where you buy and how often you change....it will add up.

try it, if you don't like it, switch back. The cost of a K&N by mail order was less than $40. The recharger kit is less than $10 and will last the life of the car.

steviej

 

That's an amazing difference from an air filter change alone. I've been getting horrible MPG (17 and lower!)due to increase in city/round town driving. Has this increase in MPG held steady since you put in the K&N filter? I think it's time I ordered one.