GrimmSpeed Dry-Con Air Filters

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It appears that you’re not the only one with excellent taste in premium automotive components! Unfortunately, this product is temporarily out of stock, however should become available soon. You can still place your order and be put in a queue; the item will be shipped ASAP. Please contact our customer service via email or phone (612-379-0000) with questions, or check for availability with our retailers, thanks!

Better Flow, More Power!

At GrimmSpeed we know that not everyone is ready for one of our full aftermarket intake systems, but still wants a safe and easy way to increase power with no tuning required. We worked hard to develop a direct replacement, dry-element air filter for the stock airbox that not only decreases restriction, producing more torque and horsepower, but is also able to filter out particulates at the same level as the OEM filter to keep your engine safe.


  • Direct OE Replacement – Drops right into the OEM airbox for an easy install
  • Oil-Free Element – Dry-Con means more reliability and easier maintenance
  • Proven Performance: Designed in the Lab, Proven on the Dyno
    • Tested +9 TQ and +6 WHP – Safe, reliable power gains 
    • 62% Better Flow than OEM – More flow/less restriction, equals more power
    • 99.1% Efficiency – Filters at the same level as OEM
    • Long Service Life – Up to 20K mile service interval 
  • Serviceable/Reusable – Simple refresh using popular cleaning kits
  • No Tune Required – Simply drop in and enjoy more safe, reliable power!
  • 1 Year Warranty – Worry free, heavy-duty construction
  • 100% Made in the USA



Filter design is a delicate balancing act, the overall goal of creating a good air filter is to find the ideal combination of flow, filtration efficiency and holding capacity. There IS a difference between simply making a unit that fits in a factory intake box and engineering a performance air filter.

Some air filters are constructed with a cotton or synthetic media combined with an oil to increase filtering ability. This can increase flow, however it also means more difficult filter maintenance because of the need to properly re-oil the filter. We decided to use a dry-construction media, utilizing two different layers of synthetic material with varied filtering and flow abilities, resulting in very similar flow capability to the oiled media while maintaining the same filtering efficiency. Since other important variables in air filter design including the pleat pitch, count and depth can make or break the performance of a filter, extensive testing was required.

We contracted a 3rd party OEM Test Lab using SAE-5011 OEM Air Filter Standards for our initial filter designs. All of these were the same size and fitment, but used varied filter media including pleat pitch, count, depth, material and construction. 

The first data set explores pressure drop across the filter before and after saturation since it directly relates to the performance potential of the filter. Chart 1 shows that the pressure drop of all clean and dirty filters was very similar, identifying the filtering ability of each panel. The next data set focuses on the filtration ability in each filter; Chart 2 illustrates that filters A and B allowed far too much of the test dust to flow through, with filter C being the optimal candidate for additional performance-based testing. We took the general construction of this unit and modified it into 3 different pleat variations.


Since ultimate performance of an air filter is based on its flow ability, we wanted to see how different pleat packs would compare to the OEM filter in terms of CFM through the filter as well as dust capacity. Chart 3 illustrates that as flow increases, capacity decreases. We see that the performance of the filters has substantially increased over the OEM unit, at the slight cost of reduction in dust capacity. Arguably the most important criteria of the filter is its ability to resist the flow of contaminants. The OEM filter was found to filter at 99.7%, with all three of our test filters scoring almost identically with 99.2% or above as illustrated in chart 4. All of these filters would be exceptional choices.



After this very comprehensive testing, we were able to select a design that meets the GrimmSpeed standard and best balanced the ultimate flow potential with the dust holding capacity as illustrated in Chart 5. This filter maintains the same efficiency as OEM, but has an increase in CFM by 62%. The reduction in dust holding capacity is an acceptable middle ground between the filter choices and will still retain a lengthy maintenance interval.




In order to properly evaluate the performance gains of The GrimmSpeed Dry-Con Air Filters, we did four wide open throttle pulls with the OEM air filter, then four more with our unit on a 2020 factory-tuned STI test car. The outlier run was thrown out and results were averaged as shown in Chart 6. We can see a solid 9 ft/lbs of torque difference and a consistent 6 whp gain from 5400rpm until redline with the GrimmSpeed filters. There is reduction in restriction in the top end that shows well here and has a direct relation to the performance of the air filter.




The GrimmSpeed Dry-Con Air Filter flows an amazing 62% better than OEM, features a 99.2% efficiency and is easy to service without the added hassle of proper re-oiling. Through testing, we saw an increase of 9 ft/lbs of torque and 6 whp at the top end of the RPM range with no engine tuning involved.


  • 19-21 STI, 22+ WRX
  • 08-21 WRX, 08-18 STI, 09-18 Forester, 13-17 Xtrek, 05-17 Legacy/Outback*
  • 93-07 WRX/STI, 04-08 Forester XT, 90-04 Legacy/Outback*
  • 17-21 BRZ/86 Manual transmission and metal intake manifold only
  • 12-21 BRZ/FRS/86 Auto transmission and plastic intake manifold for 17-19
  • 22+ BRZ/GR86 Manual or automatic transmission

*May not fit all trim models within year range

32 Reviews

J Brooks 21st Aug 2023

Dry Filter Worth It

There are few easy modifications that effectually increase power and drivability - a good high-flow filter is one of them. I have used oiled filter in past vehicles with no real issues, but I wanted to find a reliable high-flow filter that did not rely on oil for our new Crosstrek. Grimmspeed's filter dropped right in and wife and I both agree the car drives better, especially several drive cycles and the ECM learns new AF values. I'd recommend this particular filter to anyone. Oh, and yes, I said 2023 Crosstrek. The XV's airbox size for filter opening is identical to the WRX. P.S. I used some Grimmspeed boost control parts on a past vehicle with no issues ('12 mazdaspeed3).

Emory Cooper 24th Apr 2023

Essential to those looking for a difference

I was weary at first with so many brands out there, and I was put to ease when I purchased this filter. It’s simply broken down for all users to understand, especially if you’re into safe checking specs. I want to shout out that they’re consideration to the method of “NO OILING” a drop in is spectacular! Just drop and go, you’ll never buy another filter. We’ve finally found something that stomps out K&N filters in the rough, Thank You GRIMMSPEED ?

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