Would a vehicle inspector know that a Nissan would have 4 cat's though? I'd think that a vehicle inspector would simply look at the exhaust for 2 cat's, and find them, not try to search for additional cats in the headers.

Is their any other things I'm missing out on? I feel like I'm beating on a dead horse for raising this header subject, but I simply don't understand why were not taking advantage of this situation to add some roar to the engine, and some horses to the wheels. That's the whole point of this section...

I would prefer not a harsh response, but a long drawn methodical use of words from a source on this site that holds the rank for this kinda of response.