DE5 / FK8 / FL5 Coolant Expansion Tank

Eliminate one of the most well known failure points in modern K20C1 performance engine bays with our DE5 / FK8 / FL5 Coolant Expansion Tank.

• Proudly Made in the USA: 100% CAD-designed, CNC-cut, assembled, and back-purged TIG welded in house for uncompromised structural strength and precision fitment.

• Direct Drop-In OEM Replacement: Engineered as a 100% bolt-in upgrade that requires zero cutting, drilling, or vehicle modifications.

• Uses Factory Hardware & Hoses: Reuses all OEM coolant lines, spring clamps, and factory mounting locations for a fast, hassle free installation.

• Eliminates Plastic Tank Failure: Replaces the stock plastic tank notorious for cracking, swelling, and leaking under hard track use and elevated cooling system pressures... with a high strength aluminum construction.

• Textured Black Powder Coated Finish: Features a tough, heat and chemical resistant textured black powder coat for a clean, stealthy OEM-plus look that holds up against engine bay grime.

Permanent Peace of Mind for High Performance K20C1s

Track days, hard street driving, and elevated boost levels push coolant temperatures and system pressures high on the K20C1 platform. Over time, the factory plastic expansion tanks weaken from heat cycling, leading to seam splits, neck cracking, and sudden coolant loss. Our CAD designed aluminum tank permanently cures those vulnerabilities, using factory plumbing connections to deliver track tested cooling system security and a sharp, modern engine bay appearance.