A4 TQ performance chip

Hi all I have a A4 1.8 TQ MY99 and are considering adding a performance chip. Have done some research and are considering a company called "powerchip" which
claim to boost the power from 132kw to 159kw and torque from factory 235Nm to 284Nm. Has anyone had any experience with this type of performance chip or another type that may offer simular or better performance upgrade. Thanks HP
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