Introductions:1.Don't take a chance on using an extension only as often they do not work.2.This O2 cel fix without miniature cat will trick your ECU into thinking the stock is still installed. When you remove your catalytic converter, your post O2 sensor will see higher temperatures and greater flow of unburnt fuel.3.As a result this will throw check engine lights (Cel, SES, DTC) typically the error codes will be P0420 (Catalyst System Efficiency Below Threshold Bank 1) and/or P0430 P0420 - Catalyst System Efficiency Below Threshold Bank 2). For OFF ROAD use only4.Note: This paragraph does not bring miniature cat.Specifications:*Size: As the picture shown*Material : Metal*Thread: M18 X 1.5