Sinister Diesel Coolant Filtration Kit with CAT Filter – 7.3L Powerstroke
Fits 1999.5–2003 Ford F-250 & F-350 Super Duty and Excursion
Key Features
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CNC-machined 6061 billet aluminum filter block – precision-built and anodized in Sinister Blue for strength and corrosion resistance
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Genuine CAT coolant filter – ultra-efficient filtration trusted in heavy-duty diesel applications
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Pre-assembled high-temp silicone hoses with brass crimp fittings – factory-tested for leak-free performance at twice the pressure of a stock radiator cap
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Factory-style mounting bracket – installs to existing holes with no drilling or cutting required
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Continuously filters small amounts of coolant while the engine runs – removes casting sand, rust, and metal particles
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Extends the life of vital components like the EGR cooler, oil cooler, water pump, and heater core
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Simple, spin-on filter replacement design for easy maintenance
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Backed by a 1 Year Warranty
Reasons to Upgrade
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The 7.3 Powerstroke cooling system often traps debris from the original casting process—such as sand, rust flakes, and fine metal particles—that continue to circulate through your system and cause internal damage
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Over time, those contaminants clog your oil cooler and heater core, leading to overheating, poor heat transfer, and expensive repairs
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This bypass-style coolant filtration system continuously removes those particles as the engine runs, keeping your coolant cleaner and components protected
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Built from CNC-machined billet aluminum and finished in Sinister Blue, the system not only improves reliability but adds a clean, high-end look to your engine bay
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Pre-assembled silicone hoses and brass crimp fittings simplify installation and ensure long-term, leak-free durability
Product Description
Protect your 7.3 Powerstroke’s cooling system and extend the life of your engine with the Sinister Diesel Coolant Filtration Kit featuring a genuine CAT filter. Designed specifically for 1999.5–2003 Ford Super Duty and Excursion models, this kit removes harmful casting sand, rust, and metal debris that circulate through the coolant system and can lead to premature failure of key components like the water pump, heater core, and oil cooler.
The system uses a bypass design that filters small amounts of coolant at a time until the entire system is clean—without restricting coolant flow or risking overheating. The CNC-machined 6061 billet aluminum filter block mounts directly to factory holes for a clean, no-drill installation, and the Sinister Blue anodized finish provides corrosion resistance and a signature look.
This kit includes a genuine CAT coolant filter for industry-leading filtration efficiency and long service intervals. Pre-assembled silicone hoses with brass crimp fittings ensure a precise, leak-free fit and a professional finish.
Recommended Filter Replacement Schedule
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First filter: 500 miles
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Second and third filters: every 3,000 miles
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After that: once per year or every oil filter service
Kit Includes
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Genuine CAT Coolant Filter
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CNC-Machined 6061 Aluminum Filter Block (Anodized in Sinister Blue)
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Factory-Style Mounting Bracket
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Pre-Assembled Silicone Hoses with Brass Crimp Fittings
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All Necessary Fittings and Installation Hardware
Why Buy From Sinister Diesel
Since 2009, Sinister Diesel has been the trusted leader in Powerstroke performance and reliability upgrades. Our coolant filtration kits are among the most popular and proven on the market, engineered and tested in-house to meet the highest standards for durability, performance, and fitment. When you choose Sinister, you’re investing in cleaner coolant, longer component life, and peace of mind backed by real-world testing and American-made quality.
FAQ's
- Q: What is the installation time for this product?
- A: The Sinsiter Diesel Coolant Filer Bypass system takes approximately 2 hours for installation. Installation time may vary based on experience.
- Q: Why do I need a Coolant Filtration system?
- A: From the factory, many engine blocks will have sand, from the casting process, still in the cooling channels. If not filtered out, the sand can clog EGR coolers or cause premature wear of water pumps or coolant seals. Our Sinister Diesel Coolant Filtration System is a stylish and affordable "insurance" against premature failures from debris in the coolant system.
Q: What coolant filters work best with Sinister Diesel coolant filtration kits?
A: The two most popular and proven options are the WIX 24070 and the CAT 435-5142. Both deliver excellent protection against casting sand, rust, and debris that can clog your heater core, EGR cooler, Oil Cooler or water pump.Q: What’s the difference between the WIX 24070 and the CAT 435-5142?
A: The WIX 24070 is slightly taller at 5.25 inches, while the CAT 435-5142 is more compact at 4⅜ inches. The WIX filter is lighter (about 1 lb) and designed for smooth, high-flow operation, while the CAT filter is heavier (about 2 lb) with a thicker steel housing for extreme durability.Q: Which filter do most customers use?
A: The WIX 24070 is our standard recommendation for most Sinister Diesel coolant filtration kits. It’s affordable, widely available, and requires no additives—just pure debris filtration and easy maintenance.Q: When should I consider using the CAT 435-5142 instead?
A: The CAT 435-5142 is a great upgrade for heavy-duty or high-vibration applications. If your truck tows frequently, runs in harsh conditions, or you prefer OEM-grade construction, the CAT filter’s heavier shell and reinforced core are a solid choice.Q: Does either filter add coolant additives or chemicals?
A: No—both filters are non-pelleted. That means they don’t release Supplemental Coolant Additives (SCAs). If you’re running Extended Life Coolant (ELC), that’s perfect—no extra maintenance needed.Q: Are both filters compatible with Sinister Diesel kits?
A: Absolutely. Both the WIX 24070 and CAT 435-5142 thread directly into Sinister Diesel coolant filtration heads (11/16-16 thread). Fitment is perfect on Powerstroke, Cummins, and Duramax applications.Q: Which one is better for a limited space under the hood?
A: The CAT 435-5142 is shorter at 4⅜", so it’s ideal if your installation area has less vertical clearance. (Which is why it's the only choice for some kits)Q: Which filter provides better coolant flow?
A: The WIX 24070 typically offers slightly higher flow due to its taller design and lighter internal construction, making it ideal for daily drivers.Q: How often should these filters be replaced?
A: Replace the first filter after 500 miles to remove initial debris from the system.
Then replace the second filter around 1,000 miles, and the third one at 3,000 miles.
After that, change the coolant filter with every oil filter service to keep your cooling system performing at its best.
These intervals apply to both the WIX 24070 and CAT 435-5142.Q: What’s the bottom line better filter?
WIX 24070: Best all-around filter for most trucks — easy, reliable, and affordable. (Most sold filter for Sinister Diesel Kits)
CAT 435-5142: Heavy-duty option for extreme use or customers who prefer CAT’s OEM-grade toughness.Both keep your cooling system clean, protected, and performing at its best.
