A motor mechanic has been found not guilty of driving a high-performance car recklessly under WA's anti-hoon laws.

Leone Magistro stood trial in the Perth Magistrates Court accused of driving a customer's Lamborghini at 160 kilometres an hour on Reid Highway in January.

The car was impounded for 28 days even though Mr Magistro did not own it.

In his decision, Magistrate Michael Wheeler said the case was not proven because the police chase car was not able to go as fast as a Lamborghini which meant they could not be certain as to what speed Mr Magistro was driving.

Mr Wheeler said while he believed the police officers to be honest witnesses, he did not believe some of their evidence was accurate.

Mr Magistro was awarded more than $18,000 in court costs.