Overview Reviews Product Description K&N adapters allow for even more air filter applications. Product Videos Custom Field MPN 21512-1 Product Reviews Write a Review Write a Review × K&N Engineering K&N Universal Adapter 6 Inch Filter 3.5in Coupler - 21512-1 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *
Quick view Details K&N Engineering | sku: KNNRU-2510 K&N Universal 4 Inch Filter - RU-2510 MSRP: Now: $49.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-0620 K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 6 inch Height - RU-0620 MSRP: Now: $54.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-1790 K&N Filter Universal Rubber Round Straight Filter 3.5in Flange 3in Height - RU-1790 MSRP: Now: $74.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-1620 K&N Filter Universal Rubber Filter 2 7/8 inch Flange 4 inch OD 6 inch Height - RU-1620 MSRP: Now: $49.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-0620 K&N Filter Universal Rubber Filter 2 1/4 inch Flange 3 1/2 inch OD 6 inch Height - RU-0620 MSRP: Now: $54.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-1790 K&N Filter Universal Rubber Round Straight Filter 3.5in Flange 3in Height - RU-1790 MSRP: Now: $74.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-1620 K&N Filter Universal Rubber Filter 2 7/8 inch Flange 4 inch OD 6 inch Height - RU-1620 MSRP: Now: $49.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-1790 K&N Filter Universal Rubber Round Straight Filter 3.5in Flange 3in Height - RU-1790 MSRP: Now: $74.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-1620 K&N Filter Universal Rubber Filter 2 7/8 inch Flange 4 inch OD 6 inch Height - RU-1620 MSRP: Now: $49.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-1620 K&N Filter Universal Rubber Filter 2 7/8 inch Flange 4 inch OD 6 inch Height - RU-1620 MSRP: Now: $49.99 Add to Cart