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I know most people know about the after market engine air filters from Bilsrtein. Here are a couple photos of the difference of original vs Bilstein. Suderia parts lists factory filters for $168 while I think I paid about $30. The only difference is the painted Aston Martin logo and the part number.
Í recently bought a pair of these. Saw many eBay sites - all were in the UK, none were in the US with prices in the 30-35 pounds range plus shipping. I was skeptical of most of the eBay sellers and ended up getting them from Flying Spares also in the UK. 25 pounds plus 66 pounds shipping .
Not the cheapest place to get them from but at least I could trust the vendor
They arrived in a week and no additional tariff fees added.
They were a little tight but applied some silicone around the inside of the lip and they went on with a twist.
I found they were extremely tight. No amount of silicone grease or heat gun was enough to get them installed. I had two pairs on hand, and I couldn't get any of them on. No problems with the genuine AM filters.
I did have problems getting them on. How ever the hole was the same size as the ones that came off. I used a floor jack and slowly raised the jack until they popped on. I tried putting them on by twisting and even used a little bicycle grease. But hey would not go on. I have heard some people actually cut about 1/4 inch of the top rubber ring. That gives it just enough play to go on. I was told the fit is still tight and the bottom of the air box holds everything thing in place. Maybe next time I change them I will try it.
They were sure dirty.
I found they were extremely tight. No amount of silicone grease or heat gun was enough to get them installed. I had two pairs on hand, and I couldn't get any of them on. No problems with the genuine AM filters.