Apexi Panel Filter

MODEL # APE 503-N101
Manufacturer Part # 503-N101


MSRP: $35.00

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Stage 1 Performance Package 04-07 STi / 06-07 WRX ( Part Number:RSD S1-SUB-002-1)
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Apexi  is a household name in the world of JDM aftermarket products, and  have made go fast parts employed by some of the fastest cars in motorsports. So you can trust Apexi even when it comes down to a simple panel filter for your vehicle.

The Apexi panel filters are a dry cotton style filter that offers a lot of surface coverage for the most effective filtration as possible. This filter is ideal for those of you who may not want to opt for an aftermarket cold air style filter just yet. The Apexi panel filter will out-perform, and out-filter your factory panel filter which will provide better horsepower, fuel economy, and torque

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Brand: Apexi
Filter Color: Red
Filter Element Type: Dry
Filter Material: Cotton
Filter Reusable: No

Mfgr. Warranty: 1 year
Condition: New Product
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.


Verified Purchase

EJC 6 months ago
fit my 07 impreza 2.5i perfectly
Verified Purchase

Quality for a decent price
S1mpl3x1361625 8 months ago
I don't write many reviews but this is a good product. I've had three of these filters and not one problem. Better flow than OEM without sacrificing in filtration quality. It's a great little upgrade for those who want to keep their stock airbox.

Père Foura 2 years ago
Perfect fitment, and way better than a K&N filter with the dirty oil that mess up the maf sensor! 5 Star!

Perfect Fit
zombirdy05186 2 years ago
This filter fits my 1986 300zx Z31 n/a. After doing some research I found out that the earlier Z31's used an identical airbox as the 1988 Z31 but a different model filter (Every Z31 used the same airbox but a different model air filter which in reality were all the same). So technically this air filter should fit all 300zx Z31's before 1988. Or any Z with a 16500-01P00 model air box.

Awesome replacement
geraldo787b 2 years ago
When its time for you to replace that panel filter, I'd recommend this one. Fits nice and just from the change the throttle feels so much lighter on the engine. Overall smoother drivability. Also ordered it on Monday and received it today! (Wednesday)

  • Q: Is oil needed   Anthonysti 3 years ago


    Do you have to oil it before install like the k&n one or is it just a drop in without oil

    • A: This will be a dry filter.

      Kyle A. 3 years ago
  • Q: Lifespan?   Cole Matthews 3 years ago


    Just installed it tonight on my 2002 WRX sedan. Fits perfectly and has worked great so far. I live in south Florida and it is my daily driver. How many miles can I expect out of this filter? No auto-x or track or anything, just some spirited driving here and there :) thanks. I presume around 4k?

    • A: Really Depends on your location, but I would check it every oil change to be sure.

      Kyle A. 3 years ago
  • Q: Will this filter work on my car?  hhhp 6 years ago


    Hi i have a 2007 subaru impreza 2.5i and i want to replace its stock air filter. In the owner's manual it says that the stock filter has oil on it so given that this Apexi is a dry filter i was wondering if it will not cause any unwanted effects on the air sensor or the intake system. Thank you

    • A: Great question! The reason the stock filter has an oil on it is because it is a wet designed filter. This one is a dry, as you stated. We have many many customers running this filter with zero downsides! There is no unwanted effects on the air sensor.

      Sterling W. 6 years ago
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