How much tuning is available per module. For example on a 08 300CSRT ECM? Or if easier, what isnt allowed?
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The number of credits per vehicle can be found here: https://www.hptuners.com/vehicles/#supported-vehicles
This will allow you to edit the ECM and TCM parameters.
The 08 SRT costs 2 credits, which is pretty common.
Credits are $50ea.
After applying credits to unlock the vehicle, you will be able to program that vehicle indefinitely by your MPVI3.