+1, I agree with circmand, you probably wouldn't notice a difference and it could cause ECU issues. Without the proof of a dyno graph, they can't prove what they claim. For the most part, if it was a safe/vaiable way to tune the engine, wouldn't ISUZU do it?

I think chipping trucks works better because the engines are massive, capable of a lot of power and are tuned differently from the factory for towing/gas mileage rather than HP.

I chipped a subaru (stock 2.5 turboed boxer engine) and it only gained 10HP and lost gas mileage. That chip cost $695