What is needed to complete a install with a JDM header with a new cat and cat back exhaust probally going to get a Apexi World Sport, supposed to be deep tone but not raspy constant annoying tone of the N1. but do i need the gasket and flange for the header and JDM header bracket?

 

You just need the gasket for the header/cat joint. The catback should come with its own gasket

 

so whats the flange and JDM bracket for??

 

anybody?