bro,
dun wori about jdm/spore. its doesn't make much different. a few second only. the important thing is to seek for better halfcut.
jdm aka cultus has 115hp
spore only 100hp
once you got the good engine, everything can be mode to make it better.
i always found the spore hc equip with goodies like cam, nology wires, fully balancing, LSD, KONI etc..
you know what: in spore the gti is a semi racer car. the owner is like us, try to add some mode to get better performance. once it scrap, you got those.
while JDM, only use by auntie, school boys etc that is only std. some more not taking good care. the youngster are looking for turbo..
emmm,...make your choice.