the question: is what I plan to do still missing a component?

what I plan to do:

I want to get a cat-back, specifically a muffler shop fabricated system on w/ a Magnaflow muffler. then, I would like a header, specifically a 4-2-1 which has limited my choices. I'm leaning toward the Megan.

am I missing a component, or two, if I don't do something w/ the cat itself, the piping between the cat and header and what about those oxygen sensors? actually, what do you do if you want a "header-back" system? am I just wasting my time if I go so far as to add a header and a cat-back, but then nothing else?

come on gear-heads, help me out. thanks.

 

You could get a high flow cat. Also maybe get a custom made tube (whatever it's called) that connects the header to the cat.

 

unless you have one; an injen intake seems to do well