UGPM.

If it don't work, we won't sell them.

It may or might not be powerful as a remapping that cost more, but it is definitely safe to us, none detectable by factory ECU.
IT WILL NOT INCREASE YOUR TURBO BOOST PRESSURE, IT WILL ONLY SPEED UP YOUR BOOSTING TIME.

Fuel injection volume are calculate by the original car ECU, then only it will be process by RaceChip afterwards.
So how the hell the ECU can detect the changes in fuel injection volume?

If your fuel rail hits its limit, there is a shim preventing it from going over-fueling. Nowadays most of the vehicle once you hits the fuel rail limit, the shim will come to work and engine light will pop up instantly.
But RaceChip are very fine tuned nowadays, it will not cause over fueling to your vehicle. Who would want to sell something that cause problematic after sales?

If RaceChip is causing jerk / unsmooth gear changes, please lower down your tuning box setting.

For turbocharged petrol vehicle, RaceChip only plug into your MAF/MAP sensor, nothing to do with your fuel pressure. As your original ecu will calculate the amount of fuel needed to burn after receiving signals from MAF/MAP sensor.

For diesel vehicle, the only way to increase power is to play with MAF/MAP sensor, fuel commonrail sensor, fuel injector pressure, throttle position controller. This is the only way to make more power from a modern commonrail diesel engine. I've been selling Vector chip since 2008, most of my customer, also my friend has no problem claiming their warranty.