mostly im doing it for the heads mileage, mine was at 89k....this one i put on is 45k...my cars a daily driver, so im not really interested in dropping a couple thou into it or whatever for a whole b16 or any other engine swap. really not worth it to me. if i blew up my engine, then i'd consider putting one of them in. but since the engine is still good and once i get my license back i'll be putting 60+ miles a day on it just commuting back and forth to work this works for me.