Area Representative bluenose Posted April 12, 2022 Area Representative Share Posted April 12, 2022 Does anyone know the part number for the K&N filter that goes on the R500 trackday airbox?Caterham list it but none in stock and there look like very similar/same ones on EBay for less money. Wondered if it was this RU-2590? Nick Link to comment Share on other sites More sharing options...
Area Representative bluenose Posted April 12, 2022 Author Area Representative Share Posted April 12, 2022 Or if anyone has one fitted or on the shelf please can they measure the length and diameter of the cone at each end. I know the inlet size is 4"/ 102mm. Link to comment Share on other sites More sharing options...
Leadership Team Lazzer Posted April 13, 2022 Leadership Team Share Posted April 13, 2022 Length 177mm, small Dia 108mm, large Dia 136mmDon't know the part number but dimensions are from a K&N supplied by CC as part of a RBTB upgrade. Fits S3 without any mods to the bonnet beyond the cut out for the airbox. Btw, passes Snett and Brands noise limits..Good luck Link to comment Share on other sites More sharing options...
Area Representative bluenose Posted April 13, 2022 Author Area Representative Share Posted April 13, 2022 Thanks Lazzer much appreciated. Link to comment Share on other sites More sharing options...
Leadership Team Shortshift Posted April 13, 2022 Leadership Team Share Posted April 13, 2022 And it seriously stifles the engine...Not failed at Brands, or anywhere else for that matter, with the full-fat (through the bonnet) R500 carbon intake.James Link to comment Share on other sites More sharing options...
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