we will need statistics to back up anything on that topic
although i would say in a hardened thief's mind, a 4th gen prelude is 90% less likely to contain a h22 under the hood compared to all 5th gens having one. im basing this on the fact that from what ive seen, ur car gets jacked and is in pieces within 48 hours. like nothing left except the unibody.
and a DOHC VTEC motor, especially a GSR is the jackpot for these guys
thats like $2000 on the street.

~kris