I use Harry's lap timer it's fairly accurate even with my iPhone 1hz gps input. There is a 5hz module upgrade available. It honestly gives you 90% of what my Traqmate does at a fraction of the price. Great product.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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