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Description
K-Tuned K2 Pro-Circuit 2Way FK8K2 Pro Circuit 2 Way Coilovers are designed for cars looking to set track records and leave with 1st place finishes. All K2 Pro Circuit 2 Way Coilovers feature 12 way dampening and rebound adjustment. They come with stronger internals to handle all the abuse you can throw at them. Stiffer spring rates and more aggressive valving is set on K2's to keep the car stable in the corners. To make sure they will handle lap after lap we've paired up with Swift
K2 Pro-Circuit 2-Way Coilovers are designed for cars looking to set track records and leave with 1st place finishes. All K2 Pro-Circuit 2 Way Coilovers feature 12 way dampening and rebound adjustment. They come with stronger internals to handle all the abuse you can throw at them. Stiffer spring rates and more aggressive valving is set on K2's to keep the car stable in the corners. To make sure they will handle lap after lap we've paired up with Swift Springs to offer our own custom spring for all K2's. They all feature pillow ball upper mounts including older vehicles with double wishbone suspension.
Our goal was to design a suspension setup that is reliable race coilovers built with the best components. All setups feature adjustable ride height and 12 way dampening and rebound to adapt the ride to your preference. K2 Pro-Circuit 2-Way have remote reservoir and rebound adjustment to further adjust and setup the car to your driving style.
Starting with the strut, we invested a lot of time to ensure that they are both durable and reliable. We start with a durable heat-treated steel piston and needle valve to ensure proper travel and linear compression ratio. The strut body is designed to handle the heat and the life cycle it will be put through. Each strut is filled with proprietary oil that is designed to maintain its viscosity even under increased heat or abuse. The oil will keep its unique properties over the years to maintain that same ride quality. This is crucial to the quality and longevity of the strut. Poor quality suspension setups use cheaper oil that can become frothy, lose its strength and degrade overtime. These inferior suspension systems will lose their fluid movement and/or become too soft. We finish the strut piston with longstanding, high-heat rated double seals that are designed to take abuse without breaking a sweat, literally. No leaking struts here. The strut is the most important part of any suspension system. It determines the ride quality and the overall feel. We do not just use a stiffer spring at the suspension to compensate for a poor quality strut; instead we made sure to start from scratch and build a complete coilover that will differentiate itself from the rest.
Next we pair the struts with a high-tensile strength Swift Spring that is designed to last without sagging or premature wear. Swift Springs have proven themselves to last longest into a race without fatiguing. Springs are tested to ensure there is no coil bind and full range of motion. The high quality strut and dampening allows us to use the proper spring rates needed for each setup that will complement the adjustable dampening rates. Each spring is mounted on adjustable aluminum perches that can be used to adjust preload and travel. Incorporated washer and spacers are in place to keep the system free moving especially on McPherson style struts.
The coilover system is finished with a combination of powder coating, electroplating, and anodizing to give it a great look and protect it. McPherson style struts feature adjustable upper camber plates and pillow ball mounts.
Applications:
- 17 - 21 Civic Type R
Valve:
K2 Race Valve - This is our standard linear valve. Damper will get stiffer as the strut travels through its range of motion. This can give some harshness with very aggressive curbs.
K2 DS1 Valve - This is our hybrid valve. We took some characteristics from the Race Valve and our Digressive Valve to give a good mix of both. The damper is a great option for someone driving their car to the track.
K2 TD1 Valve - This is our Digressive Valve which offers the best overall performance. It will have a stiff lead in and very predictable compression throughout the range of motion. This would be the valve currently used on James Houghton's GLTC TSX and Chris Boesrma's Track MOD Civic.
Note:
Springs rates can be changed +/- 4K (up or down).
Recommended Spring Rates: F-14K / R-12K
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.1 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
Peanut Butter Bliss for Paws That Love to Gnaw
Flavor Name: Peanut Butter, Size: 2.19 Pound (Pack of 1)
Purina Busy Bone Peanut Butter Chews are like Netflix for your dog—entertaining, long-lasting, and slightly addictive. Made in USA facilities and crafted for small to medium breed adult dogs, this 10-count pouch delivers tail-wagging joy in every bite.
Why It’s a Pup Pleaser:
Peanut Butter Flavor: Irresistible to dogs and smells good enough to make you question your snack choices.
Long-Lasting Chew Time: Keeps your dog busy while you Zoom, nap, or pretend to fold laundry.
Made in USA Facilities: Quality you can trust, with standards that make tails wag and humans nod approvingly.
Real-Life Perks:
Great for dental distraction—helps reduce boredom and plaque with every chomp.
No rawhide, no worries—just a safe, satisfying chew.
Perfect size for small to medium dogs who think they’re large and in charge.
Final Verdict: Busy Bone is the chew that turns your dog into a focused, peanut-butter-loving zen master. Whether you need a moment of peace or just want to treat your furry friend, this pouch packs the kind of joy that only a good chew can deliver.
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Reviewed in the United States on September 24, 2025
★★★★★ 5
Excellent Treats for Small to Medium Dogs!
Flavor Name: Peanut Butter, Size: 2.19 Pound (Pack of 1)
I’ve purchased the Purina Busy Bone, Long Lasting Small/Medium Breed Adult Dog Chews, Peanut Butter Flavor - 10 ct. Pouch several times over the last few months, and they’ve become a staple in our dog’s treat routine! Our three dogs absolutely love them. The peanut butter flavor seems to be a huge hit, and I appreciate that these treats are made in USA facilities—I feel more confident in the quality and safety.
They’re just the right size for small to medium breeds, and they last long enough to keep our pups occupied for a while. Plus, they don’t have that overpowering smell some chews do, and they don’t leave a mess behind, which is a big plus in my book.
Overall, these are a high-quality, tasty, and reliable treat that keeps our dogs happy and busy. Highly recommend for any dog owner looking for a long-lasting chew that’s both delicious and made with care.
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Reviewed in the United States on May 15, 2025
★★★★★ 5
Mr. Diggy approves two paws up
Flavor Name: Peanut Butter, Size: 5.25 Pound (Pack of 1), Flavor Name: Peanut Butter, Size: 5.25 Pound (Pack of 1)
These just arrived earlier today, and Mr. Diggy just had one a little while ago. Well, it was gone fast. He is 60 pounds and 14 years old and loves his treats so I make sure I have good ones for him because he can’t have that many. What a nice strong bone and you could smell the peanut butter. He was so excited he took it and went to lay down. He only does that with special things. I feed my dog and cats, Purina pro and I can see since they’ve been eating it that it agrees with them and makes their coats, soft and shiny besides.
That’s why I bought these because they are made by Purina and there’s no rawhide
I bought the larger bone and I’m glad I did. It’s a good size for him. They call him a medium sized dog, but they never tried to pick him up lol I am going to check now and see what other flavors they have although peanut butter is his favorite
Try them I think your dog will like them. Mr. Diggy gives two paws up for these.
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Reviewed in the United States on March 6, 2026
★★★★★ 4
smells good, teething puppy loves gnawing on it as I hold it.
Flavor Name: Peanut Butter, Size: 2.19 Pound (Pack of 1)
I normally don't do treats like this, but my mom had purchased a small pack for my dogs. I was reticent to try it, but with a new puppy I was looking for something for little miss alligator teeth to chomp on that isn't my fingers. It worked out so well (I held it while she gnawed) that I purchased a big pack. While not meant for puppies, it has been working well for her to have something to grind her teeth on. Currently 10 weeks old, 20 lbs (a yellow lab) with super razor sharp teeth that is all about chomping on everything in her path. These slow her down for several minutes. She is blissed out as she works on it. Have to say, these arent super long lasting even with a tiny-ish puppy. But at least the price is good.
We have had the original (pretty much no odor) and these peanut butter ones which even smell good to me! I may consider these again. Be mindful of calories! 343 calories a piece. Be mindful of their serving suggestion based on size of dog. This isnt meant to be a meal, and not meant for daily consumption. More of the rare treat style.
Ingredients
Rice, vegetable glycerin, wheat flour, water, brewers dried yeast, chicken by-product meal, hydrogenated corn syrup, sugar, corn germ meal, beef tallow preserved with mixed-tocopherols, pork, natural and artificial peanut butter flavor, partially hydrogenated vegetable oil, wheat gluten, phosphoric acid, salt, sorbic acid (a preservative), gelatin, calcium propionate (a preservative), BHA (a preservative), BHT (a preservative), calcium carbonate, citric acid.
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Reviewed in the United States on November 17, 2023
★★★★★ 5
Dogs love these
Flavor Name: Peanut Butter, Size: 5.25 Pound (Pack of 1)
My dogs absolutely love these and it kept them busy
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Reviewed in the United States on May 26, 2026
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