lol, it’s a japanese car. It’s not a matter of IF it will rust out the exhaust, it’s a matter of when. Japanese cars are notorious for rusting easier than some others. This I can admit.
My Maxima was a prime example…after 2 legit winters (the previous owner garaged the car constantly), that exhaust (specifically the muffler) was toast.
Spacer was done to remove the slight restrictions in the air flow and help ‘efficiency’. Cheap thing to do and not very hard…don’t really care if it gives me 1hp or not. I got more power from the UpRev tune most likely than I did anything else. But again, power isn’t why I’m doing these things. Just trying to make it a bit more efficient…although it could all just be for naught and more of a placebo effect. Who knows.