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I gues my only question left is does upgrading downpipe help or reduce reliability of the turbo/motor if tuned correctly?

I'm just looking to make this car around 1s faster to 60mph, which should happen with only tune? Femto+ custom tune is about 1500euros as I live In Finland. I can only get catted downpipes due to legislation over here.

As title says what would be most reliable way to tune this b48 platform? Femto unlock and custom tune is probably more safe than piggyback tunes to avoid all kind of issues like LSPI (low speed pre-ignition) or other issues that may occur with limited control over ecu? what are other supporting...