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Try the app before you knock it. It costs $10 and it works. I'll get my real dyno results soon enough. I got lucky, Carmax does not inspect cars for upgraded turbos, and whoever sold the car to them put the critical components back on the car. My stock cat, intercooler, chargepipe (blew clean off 2 weeks after purchase) and intake all looked brand new.
If anything the app is a great tool to use to test your mods without paying for dyno time. Tested the app in 2 other cars now and it is very accurate and pretty damn impressive. You like tools, so why not have another performance measurement tool tht uses GPS and an algorithm that is very accurate. Check their site and see what users have posted with their physical dyno printouts compared to their perfexpert dyno results.
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