I would not have a jwt tune period so I would vote no to it being worth the extra money. Im not necessarily voting for an enthaply tune either but if you had to filp a coin between the 2 I would hope for it to land on enthaply.
Anyways I am an avid NIStune user/ dealer so I am a little partial to it but it is defenatially my vote.
I have tuned many different setups (some odd balls too) and I have yet to see its limits. Granted no one has brought me a 1000hp capable car and have me try to get them that with nistune but I have successfully tuned some powerfull cars with ease.
With you being able to get a package for your car for $500-600 or even less if there is a near by tuner shop with the cable and software for nistune already, you can surely get your car tuned for less than $1k total.
Nistune vs a jwt or enthaply tuned ecu is you can actually have your setup custom tuned for your exact car instead of sending off a mod list and having someone guess what will be best for your car.
You can achieve the best tune this way. Safest, most power, best fuel economy, best idle and drive ability ect.
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