These flat 4 pin O2 extensions will extend your GTO's rear O2 wires by 16 inches. $5.95 shipping cost is for up to 4 of this PT#! While 18" extensions fit fine, we also have 24" O2 extensions available for those who like a lot of room to work with.

If buying for a header install, please confirm the manufacturer does not already include all needed O2 extensions before purchasing these. Any returns will be issued as store credit mius shipping.

Will fit rear O2's sensors only.