I just purchased only the stage one Thornton tuning chip for a 2015 BMW 328i m sport and I’ll admit I was very skeptical because for the amount of money, it just didn’t seem like anything would happen, but I was very wrong! This chip just easily plugged into my OBD2 port under my dash and they say it takes 20 to 30 miles to tell, but I didn’t need more than one to tell that it was improving the way my car was running. This is in regular comfort mode that it is making a significant difference in but when you put it in sport or sport plus it just ups those as well! I can’t even imagine what a stage two or stage three would do if this is only a one? It is very worth the investment!
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