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Riffraff Diesel Performance Inc, Engines - Supplies, Equipment & Parts, Eagle Point, OR


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Sinister Coolant Filtration System / Filter Kit 99-03

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Part Number:

This Sinister coolant filtration system for the 7.3L Ford Powerstroke filters a small amount of coolant with each pass. The spin on the filter makes it easy to change coolant as often as you need and the filter also remove all solid particles. Usually you will use three filters in the first nine months. Once the initial nine months has passed, you will only need to change the filter once a year.


  • 1 Coolant Filter
  • Ball Valves
  • Coolant Filter Assembly
  • Coolant Hoses
  • All Hose Clamps & Hardware for Installation
  • Installation Instructions

Click here for installation instructions. 

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Product Reviews

  1. Clean Coolant 5 Star Review

    Posted by on Nov 16th 2017

    Added to the truck after a coolant system overhaul to add longevity. Should have been a stock component since these engines were cast with sand. Works like a charm and keeps the coolant looking new.

  2. Perfect upgrade part. 5 Star Review

    Posted by on Mar 19th 2016

    This kit is a great upgrade, high quality, easy installation and a perfect fit. If you are interested in reliability and longevity for your 7.3 power stroke, you need to get this coolant filter kit. It's the best quality kit on the market, and the price from RiffRaff is the same as the cheap Chinese ones. I ordered their OEM water pump, coolant tank, thermostat, and billet aluminum housing, and installed it all together. Looks great in the engine bay, and completes my cooling system update. Great priced on hoses here too. Thanks for all your help, Clay !

  3. IQ of zero can install 5 Star Review

    Posted by on Jun 15th 2015

    Install gets no ez'er ,great product

  4. Great system and easy install!! 5 Star Review

    Posted by on Apr 14th 2015

    Took about 20 minutes to install. Great fitment and looks great. If thinking of adding a coolant filter system. This will not disappoint. Shipped to my door way faster then expected. Riffraff has great produces and excellent customer service.

  5. Another great riffraff purchase 5 Star Review

    Posted by on Mar 10th 2015

    Super easy install, great price, and works like a champ. I looked at some of the other kits like this online, and this is by far the highest quality and easiest install. Thanks, riffraff!

  6. Feel secure engine is safe 5 Star Review

    Posted by on Dec 8th 2014

    Great craftsmanship. Great product. Super easy to install. And it looks great under the hood.

  7. Super easy install, very high quality kit 5 Star Review

    Posted by on Jun 6th 2014

    I got this because I was itching to do something to the truck, and Clay posted these on his Facebook :) SOLD!

    Never hurts to have more filtration, even on a 7.3L where it's not strictly necessary like on a 6.0. The parts in the kit are all very high quality, well made, and fit perfectly. The instructions were very detailed and step by step. I think in total it was a 30 minute project (I already had the coolant drained for something else I was doing). Went together no problem, installed no problem, seems to be running great.

    My only small, minor gripe, is that it only seems to come in blue with blue hoses. I would have preferred a black filter head and black hoses to keep a more stock engine bay look. For this reason I still rate it a 5.