SKU: 11765566451

K&N E-0668 - E-Series Round Straight Replacement Air Filter

Sale price$156.15 Regular price$173.50
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Description

K&N E-0668 - E-Series Round Straight Replacement Air FilterProduct Info K&N's E Series Air Filters are the epitome of performance replacement filters. The filters are specifically designed to boost your vehicle's performance without breaking the bank. The layered design and oiled cotton media is engineered to provide maximum airflow while capturing and debris that heads its way, keeping the engine cool and clean to maximize horsepower gains. The E Series Air Filter is easily installed into factory air boxes

Product Info

K&N's E Series Air Filters are the epitome of performance replacement filters. The filters are specifically designed to boost your vehicle's performance without breaking the bank. The layered design and oiled cotton media is engineered to provide maximum airflow while capturing and debris that heads its way, keeping the engine cool and clean to maximize horsepower gains. The E Series Air Filter is easily installed into factory air boxes and is easy to wash and reuse.

Specs:

  • Product Style: Unique Air Filters
  • Air Filter Shape: Round Straight
  • Base Outside Length: 5.625" (143 mm)
  • Filter Material: Cotton Gauze
  • Flanges: None
  • This Product Includes: 2 Filters
  • Top Outside Length: 5" (127 mm)
  • Washable: Yes
  • Height: 6.625" (168 mm)
  • Weight: 2.5 lb (1.1 kg)
  • Package Contents: 2 Air Filters
  • Package Quantity: 2
  • Warranty: 1,000,000 Miles/10 Year

Features:

  • Designed for performance gains
  • High air flow with excellent filtration
  • Up to 50,000 miles under normal highway driving conditions between service
  • Washable and reusable

K&N Engineering is a manufacturer of cold air intake systems, air filters, oil filters and other aftermarket performance parts. They manufacture over 6000 parts for various cars, SUVs, trucks, motorcycles and more. Founded in 1964 by Ken Johnson and Norm McDonald, hence the name of the company K&N. The duo first sold motorcycles and motorcycle parts and also supported K&N factory race team. Not long after, they saw a need for air filters that can perform under extremely dusty and dirty conditions which prompted them to move into air filters, and that quickly became their primary focus. They have maintained an active involvement in racing over the course of their history. Including the King of the West 410 Sprint Car series and NASCAR series East and West. This on its own shows pedigree, and the quality of products being churned out from their factory.



Warranty Information

K&N 10-Year/Million Mile Limited Warranty. This warranty covers defects in materials and workmanship of your K&N OE Replacement Air Filter and Intake System (the "Product"), with the exceptions stated below. This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond K&N's reasonable control (e.g., acts of God and natural disasters). This warranty lasts for 10-Years or a Million Miles, whichever comes first, from the date the product was purchased. The warranty period will not be extended if we repair or replace the Product. K&N will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, K&N will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at K&N's sole discretion. There is no charge for inspection. If you are ever dissatisfied with the materials, workmanship or performance of this Product, just give K&N a call and they'll be happy to assist you.

K&N 3-Year/300,000 Mile Limited Warranty. This warranty covers defects in materials and workmanship of your K&N Commercial Grade Diesel Air Filter (the "Product"), with the exceptions stated below. This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond K&N's reasonable control (e.g., acts of God and natural disasters). This warranty lasts for 3-Year or 300,000 miles, whichever comes first, from the date the product was purchased. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if K&N repairs or replaces the Product. K&N will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, K&N will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at K&N's sole discretion. There is no charge for inspection. If you are dissatisfied with the materials, workmanship or performance of this Product, just give K&N a call and K&N will be happy to assist you.

K&N One Year Limited Warranty. This warranty covers defects in materials and workmanship of your K&N Oil Filter, Automotive Accessory, Universal, Special or Disposable Filter, Exhaust Systems (the "Product"), with the exceptions stated below. This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond K&N's reasonable control (e.g., acts of God and natural disasters). This warranty lasts for One Year from the date the product was purchased. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if K&N repairs or replaces the Product. K&N will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, K&N will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at K&N's sole discretion. There is no charge for inspection. If you are dissatisfied with the materials, workmanship or performance of this Product, just give K&N a call and K&N will be happy to assist you.

K&N 90-Day Limited Warranty. This warranty covers defects in materials and workmanship of your All K&N POWERLID, Clothing, Promotional Material or Raw Material (the "Product"), with the exceptions stated below. This warranty does not cover damage due to (a) transportation, (b) storage, (c) improper use, (d) failure to follow the Product instructions or to perform any preventive maintenance, (e) modifications, (f) unauthorized repair, (g) normal wear and tear, (h) any type of racing or competition, (i) any off-road use, or (j) external causes such as accidents, abuse, or other actions or events beyond K&N's reasonable control (e.g., acts of God and natural disasters). This warranty lasts for 90-Days from the date the product was purchased. Coverage applies only to the original purchaser of the Product and is non-transferable. The warranty period will not be extended if K&N repairs or replaces the Product. K&N will repair any Product that proves to be defective in materials or workmanship. If repair is not possible, K&N will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at K&N's sole discretion. There is no charge for inspection. If you are dissatisfied with the materials, workmanship or performance of this Product, just give K&N a call and K&N will be happy to assist you.

The remedies described above are your sole and exclusive remedies and K&N's entire liability for any breach of this Limited Warranty. K&N's liability shall under no circumstances exceed the actual amount paid by you for the Product, nor shall K&N under any circumstances be liable for any consequential, incidental, special, or punitive damages or losses, whether direct or indirect.

California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.


Brand: K&N
Part Number: E-0668
UPC: 024844312167

Description

  • Air Filter Color: Red
  • Air Filter Shape: Round

Vehicle Fitment

Year Make Model Sub Model Engine Size
2008 - 2010 AUDI R8 BASE 4.2L
2011 - 2015 AUDI R8 BASE, SPYDER 4.2L
2013 - 2014 PORSCHE BOXSTER BASE, S 2.7L, 3.4L
2014 PORSCHE CAYMAN BASE, S 2.7L, 3.4L
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 11765566451

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4.3 ★★★★★
Based on 1911 reviews
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Product Reviews
A
Verified Purchase
Amazon Customer
Fort Morgan, US
★★★★★ 5
Perfect Pillow
Size: Queen (Pack of 1), Color: White
These are the best pillows ever. You can adjust the firmness or softness to whatever you want. For years i used a soft latex pillow , which you cant get anymore. I will never use another pillow. I have purchased 6 of these after the first one. You pick your own comfort level. Best ever. No more neck aches.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
M
Verified Purchase
Mark
Belleville, US
★★★★★ 5
Hallelujah… finally, I found the right pillow!!!
Size: Queen (Pack of 1), Color: White
I have spent a lot of money searching for the right pillow. I recently tried to Tempur-pedic that cost twice with this pillow cost. Tempur-pedic flattened out. I’ve had this pill for a few weeks now and it works wonders. I am a paraplegic. You can have a lot of neck problems. I love the fact that this pillow is adjustable. I immediately saw it was too stuffy and took a bunch out. It works perfect so glad I didn’t spend money on a $200 purple pillow. I read a lot of reviews and there were a lot of complaints about the odor. Mine did smell funny when it came out of the box. I immediately threw it in the dryer with a few bounce fabric sheets came out smelling fine. Pillows are a very individual thing, but I think for 40 bucks this pillow is worth a try. I’m really enjoying mine about one of those silk pillowcases to go over it and it sleeps cool and comfortable. Best wishes in your search for the right pillow. Update: I’ve been using this pillow several months and it continues. Give me a good night rest pain-free.. well worth the money. UPDATE: I have been using this pillow for three months and it still works great. It does not flat out or get hot..
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
D
Verified Purchase
Danica Mandic
Massapequa, US
★★★★★ 5
Soft comfortable very good pillow
Size: King (Pack of 1), Color: White
I really love my new pillow it's great and comfortable. Yes, it has a little smell, but if you wash the pillowcase and put the pillow on the window for a day you won't notice anything anymore.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
Z
Verified Purchase
Zachery Jeffries
Cuba, US
★★★★★ 5
Best place for head
Size: Queen (Pack of 1), Color: White
Do you love not getting sleep and sweating all over your pillow at night when you are asleep? If so then don't buy this pillow! If you want a good nights sleep and cool pillow like me this is the one. Ive always been ehh towards spending so much on a pillow but its 100% worth it, I sleep so much better and it forms to my head and keeps me cool at night. Great support even for my big head and comes with a bag of extra stuffing if you want to have a little more firmer pillow. Highly recommend
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026
L
Verified Purchase
Loves_2_read
West Palm Beach, US
★★★★★ 3
Oversized
Size: Queen (Pack of 2), Color: White
I have chronic neck pain. I am forever buying new pillows. Sometimes I think I found the perfect pillow but then three months later they’re losing their loft. I thought I would give these pillows to try since the stuffing is removable. Now these pillows are really oversized. To the point where I thought that they had sent me king-size pillows but I double checked the packaging and they were Queen. I ended up having to buy king-size pillowcases for them because they just barely fit in the queen size and the pillowcases would always end up pulling back from the edge. So that’s a negative one star there. Now I’ve been sleeping on these pillows for a while and they have held up well. I did end up removing some of the stuffing because it was just too much. I’m a side sleeper and when I use this pillow, it does a good job of keeping my neck in alignment. However, the pillow tends to migrate up as I sleep. Or I tend to slip down off the pillow, either or. So that’s why I’ve removed a second star. Maybe if I removed more stuffing that wouldn’t happen, but then I feel like the loft would be too little. I will say that these provide great support when sitting up in bed reading or watching TV. So would I buy them again? Probably not. Am I going to keep using them? Yes
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 23, 2025

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