Just talked to the guy at the custom shop. Apparently the speedometer will be off by about 5mph going 75-80. Between 0-50 the difference will be minimal. After 50 it'll read slower than I'm actually going, but won't be too far off (no more than about 5 mph). As long as I realize that when I'm driving, I should be fine. Plus, that's what the Valentine One is for. He said the car might be a little sluggish on take-off because of the weight, but said I shouldn't notice that much of a difference, especially on the freeway. Sounds like I'm going to have to get some performance mods down the line to bring the power up. And apparently they can't reprogram the speedo b/c no programmer's are available YET for the H3.
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