just sayin it really depends on the person, money and time put into a specific car, this guy i use to know owned a d-series and didnt want to get rid of it, but wanted more power out of it, he upgraded the ecu, and welded about a good 4 inches onto the block gave it a longer stroke and finally pushed about 250hp at wheels on a sohc, but it cost him close to 6g's just to get the block right, just didnt like dohc i guess