Reviewed by Rusty M (West Palm Beach, FL) — Sep 19, 2009 5:17 AM

No A/market airbox...just the K&N in my 08 Chevy Duramax/Allison. Big difference in response and now have noticed about a 2 mpg gain. Super easy to install. Have em' in all my toys. They just work... Period! Autoanything.com is now my go-to place for "car stuff". Great prices, shipping, etc.

Reviewed by gary b (Le Roy, NY) Reviewed for a 2007 Chevy Silverado — Nov 25, 2008 2:41 PM

saw an increase in MPG nice thanks!

Reviewed by Adan Y (San Antonio, TX) Reviewed for a 2006 GMC Sierra — Oct 29, 2008 7:50 AM

Have not had it long enough yet, but I'm not seeing an improvement in the milage nor on the horses. But i'll wait.

Reviewed by Jeff L (Dublin, CA) Reviewed for a 2006 Chevy Silverado — Oct 23, 2008 8:31 PM

i have a 2006 chevy duramax and i bought a k&n air filter. the oils in the new filter made my mass air flow sensor go bad and my check engine light came on. according to the dealer it is not coverd under warranty. the sensore alone is about $450 and labor was about $70.

Reviewed by Charles M (Rancho Cucamonga, CA) Reviewed for a 2007 Honda Ridgeline — Oct 21, 2008 9:05 AM

I bought two filters one for my Honda Ridgeline and one for my Chevy Diesel. I have not used the Chevy yet but I did go on a long drive up the coast and found that I got about two miles more to the gallon in the Ridgeline I am very please with it.

Reviewed by Jerry H (New Knoxville, OH) Reviewed for a 2008 GMC Sierra — Sep 26, 2008 4:56 PM

Have one on a 2008 GMC Duramax and another on a 2006 Sienna. Well worth the money!

Reviewed by James R (Cattaraugus, NY) — Aug 08, 2008 8:53 AM

The air filter fits really tight, which is a good thing. I tried several times, to install air filter, unsuccessfully, until I finally used the tube of lubricant, which is included in shipping box. I haven't had a chance to drive my truck any distance, yet, to see if the fuel economy or overall performance is going to improve. My truck is a 2008 Chevy Silverado HD3500, 6.6 duramax diesel, crew cab, 8 foot box, 4 wheel drive, dually.

Reviewed by LARRY B (Hallettsville, TX) Reviewed for a 2007 Chevy Silverado — Jun 06, 2008 10:32 AM

I HAVE USED K&N IN TRUCKS OVER THE YEARS AND HAVE ALWAYS HAD GOOD RESULTS. THE DESIGN'S ARE NEAR PERFECT AND I HAVE AWAYS NOTICED THE RESULTS. I OF COURSE TESTED MY 07 DURAMAX BEFORE I INSTALLED THE K&N AND AFTER. I WAS HAPPY AS IN THE PAST WITH MY FORD AND DODGE INSTALLATIONS. THE POWER GAIN WAS NOTICED IN STOCK SETTING OF MY BULLY DOG PROGRAMMER. AND THE FUEL SAVINGS HAS BEEN 1.5 TO 3 MPG. I INSTALLED THE K&N INTO A COLD AIR INDUCTION BOX THAT I DESIGNED. AT 55 MPH MY BEST AVG. HAS BEEN 28.2 MPG. AND AT 65 TO 75 MPH I STILL GET 20 TO 23 MPG. WITH THE K&N AND THE BULLY DOG IN PERFORMANCE MODE. 90 HP ADD SETTING. THANK YOU K&N AND KEEP UP THE GOOD WORK. LARRY FROM HALLETTSVILLE TEXAS

Reviewed by Clarence L (Agassiz, BC) Reviewed for a 2007 GMC Sierra — Jun 01, 2008 8:55 PM

The K&N Air Filter was very easy to install. It took me less than 10 minutes from the time I started to remove the screw on the air filter compartment. I just returned home from a fishing trip to Central British Columbia. My pickup has more power and does not work as hard to get to cruising speed as it previously did before I installed tne new K&N Air Filter. I am now waiting to see if my fuel consumption improves. The fact that the K&N Air Filter is permanent, will save me money by not having to purchase regular air filters. So, as far as I am concerned I am already ahead even if the fuel consumption does not improve. Thank you for the easy to follow instructions!!! Clarence

Reviewed by Shirley H (Rapid City, SD) Reviewed for a 2006 GMC C/K 3500 — May 23, 2008 7:17 PM

I've been using K&N filters for many year in my motorcycles and vehicles. They have alway performed outstanding.

Reviewed by Maurice M (Waxahachie, TX) Reviewed for a 2008 Chevy Silverado — May 07, 2008 2:04 AM

After installing chech engine light came on next day, removed it a week later and replaced with the stock filter 2 days latter Check Engine light goes off. So much for the 08 Duramax and the K&N.

Reviewed by Bret P (Bristol, CT) Reviewed for a 2007 GMC Sierra — May 06, 2008 5:22 AM

Installed this filter to replace the stock element on my '07 GMC Duramax LBZ. It made a very noticeable increase in power and throttle response, while greatly reducing black smoke under hard acceleration. There was no increase in noise. For $51 this is the best upgrade you can make.

Reviewed by Thomas E (Clackamas, OR) Reviewed for a 2006 Chevy Silverado — Oct 23, 2007 9:12 AM

I haven't noticed any improvement in drivability or mileage in my 06 Chevy Silverado 6.6L diesel (gobs of power anyway) but the price was great and I know from past experience with K&N that this is the only filter I will ever have to buy for this truck.

Reviewed by Donald D (Edgewater, MD) Reviewed for a 2007 Chevy C/K 3500 — Aug 04, 2007 7:05 AM

I realy like my K&N air filters I have had one on my 1996 chevy.1500 for 8 years and just put one on my 2007 chevy 3500 buy the way I also have one on my ATV Don

Reviewed by Fidencio Z (Brea, CA) Reviewed for a 2006 Chevy Silverado — Jul 11, 2007 10:05 PM

The airbox lid would not completely close due to several "fins" needed to keep the stock filter in place. I noticed an immediate difference in performance but I lost about 2 mpg. Overall I am not happy with this filter and I would highly recommend to keep your motor stock.