When Maxima owners get the infamous P0420 check engine light code for bad pre-cats, the best route is to go with eBay headers. However, when you search eBay there are various types of header listings that pop-up. This post goes into a little more details about what modification are required…
Helpful Install Information on the Various Types of eBay Headers
Relevance: 100% Posted on: 01/30/2018