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-3280 K&N Filter Universal Rubber Filter 6 inch Flange 7.5 inch Base 5 inch Top 10 inch Height - RU-3280 MSRP: Now: $64.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-3580 K&N Filter Universal Rubber Filter 3 Inch Flange 6 inch Base 4 inch Top 5 inch Height - RU-3580 MSRP: Now: $49.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-3120 K&N Universal Rubber Filter - RU-3120 MSRP: Now: $59.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-3280 K&N Filter Universal Rubber Filter 6 inch Flange 7.5 inch Base 5 inch Top 10 inch Height - RU-3280 MSRP: Now: $64.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-3580 K&N Filter Universal Rubber Filter 3 Inch Flange 6 inch Base 4 inch Top 5 inch Height - RU-3580 MSRP: Now: $49.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-3120 K&N Universal Rubber Filter - RU-3120 MSRP: Now: $59.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-3580 K&N Filter Universal Rubber Filter 3 Inch Flange 6 inch Base 4 inch Top 5 inch Height - RU-3580 MSRP: Now: $49.99 Add to Cart Quick view Details K&N Engineering | sku: KNNRU-3120 K&N Universal Rubber Filter - RU-3120 MSRP: Now: $59.99 Add to Cart ×
Quick view Details K&N Engineering | sku: KNNRU-3120 K&N Universal Rubber Filter - RU-3120 MSRP: Now: $59.99 Add to Cart