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Description
K-Tuned K2-Circuit 06-11 Civic Si (8th Gen) 06-11 Acura CSXK2 Circuit Coilovers are designed for cars destined for the track; whether that's circuit, time attack, or drag racing. All K2 Circuit Coilovers feature 32 way dampening and stronger internals to handle all the abuse you can throw at them. Stiffer spring rates and more aggresive 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
K2-Circuit Coilovers are designed for cars destined for the track; whether that's circuit, time-attack, or drag racing. All K2-Circuit Coilovers feature 32-way dampening and stronger internals to handle all the abuse you can throw at them. Stiffer spring rates and more aggresive 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 coilover built with the best components. All setups feature adjustable ride height and 32-way dampening to adapt the ride to your preference. K2-Circuit comes with pre-set rebound for a simple setup that can quickly be set to your driving style. If you're looking for rebound adjustability K2-Pro-Circuit 2 Way feature rebound and compression adjustment.
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.
Application:
- 06-11 Civic FG
Spring Rate:
F-14K / R-12K
Note:
- Springs rates can be changed +/- 2K (plus/minus). If you want custom spring rates please contact us directly.
- Some light modification may be needed when installing rear. Please email to inquire before ordering.
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.
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 ★★★★★
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Product Reviews
★★★★★ 5
Good alternative to traditional gums- no aspartame no artificial coloring.
Flavor Name: Spearmint, Size: 55 Count (Pack of 1)
Love this gum, no aspartame, no artificial coloring and good taste, you get used to chewing it for a long time, the taste goes away little faster than traditional gums but I don't care
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Great Xylitol Chewing Gum!
Flavor Name: Spearmint, Size: 55 Count (Pack of 3), Flavor Name: Spearmint, Size: 55 Count (Pack of 3)
This review is for PUR Gum | Aspartame Free Chewing Gum | 100% Xylitol | Natural Spearmint Flavored Gum, 55 Pieces (Pack of 3). I got 2 of the 3-pack at the time because it was cheaper to do so than to get a 6-pack. Of course, the next day the 6-pack was cheaper lol. Anyway, this is great xylitol gum and not overly expensive like Zellie’s. I take 2 (which is one serving meaning 2g of xylitol) after “most” meals because it’s supposed to be good for my oral health. I chew one piece at a time for a couple minutes to prolong the sweet flavor instead of popping both into my mouth together. I like chewing these because they don’t harden up like some gums do. They stay soft throughout and I often forget and chew them for 15-20 minutes at a time. Anyway, I did the math and compared the PUR gum to other 100% xylitol gums out there and this one was a clear winner to me for the same benefits. I would totally recommend this gum and I like that it’s aspartame free! I’d give it a 5.0/5.0 - 03/20/2026.
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Reviewed in the United States on March 20, 2026
★★★★★ 3
Great taste but cannot use
Flavor Name: Spearmint, Size: 55 Count (Pack of 1)
First time trying for dental care. Really enjoy the taste only drawback taste doesn’t last long. However, it’s better than other sugar substitutes which my stomach does not like.
Glad I signed up for the three pack sub. Great product! Recommend.
May 16, 2026 Update: Unfortunately I cannot use this product after the initial trial every time I chew on these i experience stomach issues so the three pack I purchased will need to find someone that can use them or throw out.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Powerful lasting peppermint flavor & the xylitol fights plaque!
Flavor Name: Spearmint, Size: 55 Count (Pack of 6)
The gum has a powerful peppermint taste – very refreshing. The flavor lasts a long time. The main reason that I bought this gum is because it has 100% xylitol. Xylitol helps fight plaque buildup. I have only had the product one day, so I can't say that it works, but I read many reports before I bought the gum that xylitol is excellent for fighting plaque buildup. It also has no sugar. It's vegan and it has only five calories per two pieces. I have so far only chewed one piece at a time. One piece seems plenty for me. I've read that people need from six to ten grams of xylitol per day to effectively fight plaque. So, this gum needs to be chewed accordingly. Many people chew after every time they eat. I am happy with this purchase.
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Only protein shake I've found that doesn't cramp my stomach
Flavor Name: Chocolate, Size: 14 Fl Oz (Pack of 12)
I've tried the vanilla, strawberry and chocolate, and chocolate is by far the best. It's not too sweet (where as the vanilla and strawberry were). It doesn't have any extra whey concentrate or caseinate or soy or whatever added to it to boost protein. Brands that do that mess up my stomach, giving me bad stomach cramps. This is just highly filtered milk, and lactase enzyme that tackles the lactose sugar left behind after filtration. Maybe that's the secret. (I can drink normal milk and not get cramps. But, whey protein isolate and other things give me cramps.) This has become a go-to in a protein diet I'm on. I'll have one for breakfast with some coffee. That lasts me until lunch. If not, I'll simply have another 2 hours later. They're each less than 200 calories, so it's not too bad having another if it staves off hunger. I find I eat a smaller lunch. I might have another one for a mid-afternoon snack. Then I'll have a normal dinner. Basically I'm replacing bigger meals and a breakfast with 2-3 smaller calorie protein shakes. And the protein keeps me satisfied. (unlike something like slim fast that's just all sugar and ramps up your insulin). They're a bit pricey (almost $4/bottle). But, I'm cutting back on my grocery bill as well. So, it's balancing out. I figure I could be spending $12/day on fast food or some other garbage that makes me fat. Instead I'm drinking 2-3 of these a day, and am down 10lbs over a month. I'll stick with these.
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Reviewed in the United States on April 27, 2026