Like I said before, factory knock sense is very very indepth and good compared to aftermarket ecu's and knock sensing devices.
They are tuned using listening devices, then they factor out engine noise at all rpm ranges which is hard to duplicate(most of the aftermarket stuff will only work at a certain rpm range because of this, so your best off setting it up for around torque peak where knock is most prevalant, which is around 5000rpms for 2.4's). Even if you buy one of these add on/replacement setups you will still need some det cans to interprupt and tune it. So you might as well just tune w/ det cans and not worry about it unless you trying to push the limits or bad gas is concern
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