retail for the optional wire harnesses to add functionality is $40 each. That is not a lot f money.
For a turbo car you are looking at
$279 +$120 = $399. Then if you are installing yourself you need the software $140
That is $539 for eveything you need.
Now Link prices, using WRX prices, since there is no Plug and Play for the RS.
$1250 for link, plus $70 for serial link
That is $1320, more than double the price of the entire greddy unit.
Again, I will stress that these are not competing products. There is no way the Emanage will compare the features and ability of any fully stand alone product.
to be more effective you would have to compare it against the SAFC+ITC+ some way to read boost pressure for your tuning.
retail for an SAFC is $419 and ITC is $399.
again you see the savings.
If what you need fits in this piggy back category, then the Greddy Emanage is another choice to consider.