BC Racing DS coilovers, CADILLAC CTS MK1 (SIGMA I) 2003-2007

BC Racing Height-Adjustable Coilover Kit – CADILLAC CTS MK1 (SIGMA I) 2003-2007 (SEDAN)

The smartest suspension upgrade for your Cadillac!
BC coilovers are one of the most popular suspension kits among car enthusiasts around the world – and no wonder. Premium ride quality at a reasonable price and surprisingly versatile adjustability. These kits allow proper height adjustment from the shock body, separate preload adjustment, and 30-way damping control. In some models or with optional parts, camber and caster adjustability are also possible.

You’ll find multiple BC series in our shop – the most popular being the versatile BR series.
Read more about special models like the tight and firm digressive DS, ultra-low BR Extreme Drop, BR Track, and full 2-way and 3-way motorsport kits.

* Check our guide –> Suspension Buying Guide *

Note for our international customers
Our focus is on selling BC Coilovers primarily in Finland, where we operate. For Finnish customers, we provide full documentation for road registration. Therefore, for international customers outside Finland, we are unable to offer or supply TUV, E-cert, or similar documentation beyond the general quality certificates provided by BC Racing manufacturer.
If you require a certified suspension kit that complies with your local regulations, please contact us to ask about available alternatives!

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Technical Specs

Fitment: CADILLAC CTS MK1 (SIGMA I) 2003-2007 (SEDAN)
Product code: ZN-03 DN
Coilover type: DS
Springs (front/rear): 62-97-260-12-V / 89-62-220-12-V
Dampers (front/rear): Digressive Monotube / Digressive Monotube
Top mounts (front/rear): No upper mount / Rubber dampened top mount

NOTE: All coilovers are designed for 2WD models with standard suspension unless otherwise specified.
Front or rear struts, spare parts, and even custom setups are available – just ask!

In models with OEM EDC electronic suspension, air suspension, or similar, an electrical disconnection may be required to avoid fault codes. Depending on the car, this can be done via coding or using a separate delete kit – contact us for advice.

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Why buy your BC coilovers from Futurez?

• FREE SHIPPING in Finland – and a variety of affordable international shipping options!
• CUSTOMER SUPPORT – Need setup help or a custom spec? Reach us via WhatsApp! –> Contact us
• SAVE WITH F* BONUS POINTS – Earn points you can use for future purchases.
• INVOICE & INSTALLMENT OPTIONS – For Finnish citizens, ask about Resurs Bank or Innovoice!
• PROFESSIONAL INSTALLATION AVAILABLE – For local customers, ask for a quote at our Vantaa location.

Don’t forget to get a wheel alignment after installation!
Check the “Wheel Alignment Adjustment” add-on on the product page to benefit from a discount.

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Construction

BC Racing coilovers use a monotube damper housed in a lightweight aluminum body.
The shock shafts are black chrome steel to resist seizing, and steel lower brackets are powder-coated for durability.
Each coilover is car-specific, factory-matched, and measured before packing – not a universal solution.

Serviceability & Custom Options

We offer nearly all parts as spares – including different spring lengths and rates to suit your needs.

Model Series

BC Racing offers a wide range of series – from the popular BR street coilovers to motorsport-spec kits with external reservoirs.
Fully customized kits are available, including spring rate selection and setup modifications.

Installation

These coilovers are installable by skilled DIYers in a home garage.
Professional installation is also available – especially convenient for customers near our ECU Helsinki location in Vantaa.

Adjustability

• Proper height adjustment via damper body – not just preload.
• Separate preload adjustment allows setting corner weights independently from ride height.
• Damping force adjustable in 30 steps – some kits offer 1, 2, or 3-way adjustability depending on the model.
• Camber adjustment is available on some models (Camber/Caster plates also sold separately).

Top Mount Type

Depending on the model, BC coilovers use either rubber-dampened fixed top mounts or pillowball top mounts with camber adjustment.
NOTE: Some models may reuse OEM top mounts – check the product details for your specific car.

Spring Type

Spring specs are listed as: Diameter / Length / Rate (kg)
You can view the default specs in the product details.
If you want different spring rates, leave a note at checkout or contact us for advice – we generally recommend sticking to the default rates.

Legal Registration and Certification Documents

BC coilovers are eligible for official inspection and approval in Finland, with documentation we provide with the kit.

Important: Please note, our focus is on selling BC Coilovers mainly in Finland where we operate.
Therefore, we can’t offer TUV, E or similar documentation for legal road use for our international customers for this product.

Warranty

BC Racing coilovers include a 2-year warranty.
Finnish customers can upgrade their product with our F* Extended Warranty – ask for more info.

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Please note: BC Racing coilovers are made to order based on your specifications and are considered custom products with no automatic right to exchange or return.