when I added a stillen supercharger to my 350Z, I did tell my insurance. Progressive, at the time. but I also had a ton of other mods. They increased the premium, but only because I wanted extra coverage for the cost of the supercharger and mods. It was about 5 dollars a month, but I added an additional 15000 in coverage. It had nothing to do with the added power though.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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