K & N intake benefits

[maximus_188]

I have a 98 GMC Sierra 4x4 Z-71 with the 5.7 350. I just added true dual flowmaster exhaust, and was thinking about putting a K & N cold air intake, and was wondering how much it would benefit my hp, torque, and gas mileage. Thanks.

[Guy]

I had the K&N in my twin turbo Stealth and really noticed no difference in mileage or seat of the pants HP gauge. However it made my exhaust note deeper and louder and you could hear the turbos spool up better and the blowoff valve was much louder!

[DAVESCHIM]

Small, unnoticable performance and mileage gains. Almost triple the dirt that got thru the filter and into my oil.

[John Styrnol]

Originally Posted by DAVESCHIM

Small, unnoticable performance and mileage gains. Almost triple the dirt that got thru the filter and into my oil.

I've also heard about more dirt, but maybe a good solution would be to get the new Amsoil filters instead.

[truzoom]

I plopped one into my F150 and felt better throttle response right away. I can't say much for fuel mileage because I sure liked driving more enthusiastically after putting it in.

I have read a lot saying that they aren't cut out to be this and that, but I like the convenience of not having to worry about replacing it. Where I live, there isn't a whole lot of dirt in the air so I find myself not having to clean it much.

[Danase]

I used one once in my 4.3L Sonoma and hated it because no matter how little oil I put on the filter it always ended up messing up my throttle body. But if you got he cold air route it should put the filter far enough away from MAF sensors and stuff like that. Honestly, the best filter I have ever used was an Apexi oiless cone filter. Plus they also got the best airflow and filtering ability in a test I read.
One thing you might want to do after you are done modding the truck with the exhaust, filter and whatever else is have a good tune done to it. That should help as well.

[DETAILKING]

I did a K&N cold air kit in my old Z-28. That together with a borla exhaust really improved performance to the point that you can feel it. I got better gas milage too.

Are you going with a direct replacement filter, or a conical cold air filter kit?

[Surfer]

Originally Posted by John Styrnol

I've also heard about more dirt, but maybe a good solution would be to get the new Amsoil filters instead.

The new Amsoil filters are awsome, flow better and you don't get that oily coating from others messing with your maf. Get's a litle dirty just take it out and vacuum it.

I have a custom intake and dual exhaust on my truck, me likely V8 sound

[74 thing]

I don't know what kind of fan you have on that truck, but I think you would see better mileage and hp with an electric fan set up instead of the belt driven one.

[CelicaLover]

If you do decide to go with a cold air intake check on ebay for one as there alot cheaper and they're the same exact thing. Just bought one for my 2000 celica and I can really feel the increased HP in the higher revs nothing different on fuel mileage though.

[Kanchou]

it mostly depends on the car and how much air its trying to pull in under load. If that is being significantly restricted by the stock box, or the stock box gets really hot, then a CAI will help.

K&N isnt all that different from any other gauze type filter. but for maximum performance, its a good idea to clean it every 2 oil changes. Those suckers filter well, but get dirty quickly and then dont filter so good no more.

[ZeusCGP]

Actually the dirtier they get the better they work. The catch 22 with filters is the better they flow, the larger the passages must be to allow more air through, so the more dirt is passed.
K&N kits are ok, but fairly expensive. Keep looking around or concider building your own.
I picked up 1 or 2 mpg with my coldairintake.

Used about 1.2oz of oil.
25,000 miles/


after cleaning


after reoil