DMS 1.5 Gallon Supercharger Fender Expansion Tank – 2016+ Cadillac CTS-V
The DMS 1.5 Gallon Fender-Mounted Supercharger Coolant Expansion Tank is a complete cooling upgrade designed specifically for the LT4-powered Cadillac CTS-V.
Adding 1.5 gallons of coolant capacity significantly increases the thermal mass of the supercharger intercooler system, helping slow heat soak and maintain more consistent performance during repeated pulls, spirited driving, drag racing, and track use.
The tank mounts cleanly inside the fender, keeping the additional coolant capacity away from engine-bay heat while maintaining a clean, factory-looking engine compartment.
Key Features
- Adds 1.5 gallons of coolant capacity
- Helps slow heat soak during repeated high-load use
- Hidden fender-mounted design
- Laser-cut .125" aluminum construction
- TIG welded in-house at Dedicated Motorsports
- Pre-assembled -12AN coolant lines
- 1/8" NPT air bleed port and bleeder line
- Three solid mounting points
- LT4 supercharger adapter fitting
- OEM heat-exchanger adapter and clamps
- DMS filler/bleeder tool included
- Complete mounting hardware and hose clamps
- No fender removal required
- Approximately 45-minute installation
Complete Installation Kit
This isn't just an aluminum reservoir. The DMS Fender Tank includes the plumbing, fittings and hardware needed to integrate it into the factory supercharger cooling system.
Kit Includes:
- DMS 1.5-gallon aluminum expansion tank
- Pre-assembled -12AN coolant lines
- 1/8" NPT air bleed port and bleeder line
- LT4 supercharger adapter
- OEM heat-exchanger adapter and clamps
- DMS filler/bleeder tool
- Mounting hardware and hose clamps
The LT4 adapter can also be adapted for use with other supercharger systems, including Magnuson applications.
Installation
Installation typically takes approximately 45 minutes with normal hand tools and does not require removal of the fender.
The wheel, inner fender liner, engine cover and plastic fender trim are removed for installation and reinstalled once the tank is in place.
Fitment
2016–2019 Cadillac CTS-V with the supercharged LT4 engine.
More Capacity. Less Heat Soak. Clean Installation.
With 1.5 gallons of additional coolant capacity, -12AN plumbing, hidden fender mounting and in-house TIG-welded construction, the DMS Fender Tank is a complete supercharger cooling upgrade engineered specifically for the CTS-V.
