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.
As i heard
Aftermarket BOV have problems with the Mitsu's
After running on boost and pressing the clutch to neutral
the engine rpm will slowly drop bt drop down and die..
you also will be running rich (accodring to...