for standalone
its good if ur hardware edi upgraded, then only u opts for this. standalone is a new ecu, u need a tuner u insert all the data back to the system
since stock ecu system is great enuf for stock/minor mods car, so its not suggested if ur car is not fully loaded :)
if everything is stock or just wit minor mods, add SLD or rsm or any gadgets tat can eliminate speed cut
or reflash oso can unlock several stuffs...gain hp/torque as well