I am reviving this thread because i can't take reading 30 threads to get one piece of information.



So, it took two pages to decide what enthusiasts for all other major car brands have been doing for ages. Thank you to Cyclemut for clarifying what each of the parts is for and telling us all what needs to be done. The Corvettes (LT1 cars) had a very similar problem and you could only (until recently) put shorty headers on them because of this. It is not rocket science here and i truly believe that headers will make a huge power gains coupled with exhaust and intake on my 2003 supercharged. So, in short, i need to keep the primary o2 sensor on the header, install the cat immediately after this, then have a custom exhaust shop fabricate the rest(since the aftermarket pre-fabs won't bolt up any longer) and weld in a bung for the secondary o2 sensor which is to remain stock as the sims don't work well. sheesh....