Does anyone have any experience using the JB4 piggyback tuning module?
I'm just curious how much more hp and torque a unit like the JB4 could provide to the GR Corolla?
I like the idea of a JB4, because it can be removed with no trace, if you need to take your car in for service at a Toyota dealership.
I'm just curious how much more hp and torque a unit like the JB4 could provide to the GR Corolla?
I like the idea of a JB4, because it can be removed with no trace, if you need to take your car in for service at a Toyota dealership.