If your not planning on doing a lot of mods to your car I would go the piggy back route. But then if you want to get more mods done to your car in futures
you may need(depends on weather you can drive bigger injector or 300zx air flow) to replace it with something like Power FC, Motec latter
. This is what I had to do(which meant I had to buy twice
:? ). I don’t have issues with cold start either
.
When I replace the uni-chip(piggy back) in my car I asked the tuner several times about fitting a motec( because everyone said it’s the best). They said I would not see any real gains in HP so they fitted the power FC instead.