Downpipe on an N/a
#3
Former Moderator. RIP Icemark.
A down pipe on a NA replaces 1 or 2 cats... so yes it will be an improvement, without the port/combustion noise associated with a header.
#5
Ya a midpipe should help more since it replaces the main cat(as long as the precats aren't in too bad of shape. But I suggest you replace all of your cats with 2.5" piping. That with the N1s should make a nice improvement, especially if the cats are 12+ years old.
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