High-performance iridium racing spark plugs, pack of 6. - Brand: DENSO - Model: IRIDIUM RACING - Type: Spark Plug - Pack Size: 4 Pack - Part Number: IQ01-24#4 5707#4 267700-1411 For sale due to a change in use for RB26. Used for 5000km. These are used items, so please understand that sales are final (no returns, no refunds, no exchanges).