if u dont want paper also can. but then u need to punch back ur original engine number, provided its dohc b series. if sohc also can but then puspakom will be suprised to see dohc engine with b16a marking on it.....ekekeke
if u not planning to endorse the engine (mean illegally punch back the number to ur current engine number), then no need the paper. if u want to legally registered the engine regardless into crv or civic, u need a paper to endorse it.
if u buy b20b block n punch back the number then put it inside ur crv, then no need paper.
i'm just help my friend to find evo5 airflow sensor...
but not sure the code no....
if u have evo4 airflow sensor also can consider....
1 more thing... i need help to find evo4 airflow sensor wiring diagram...