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Message: <blockquote data-quote="ken" data-source="post: 357676" data-attributes="member: 6135">i've been on a HIOP tune for past 18 months and done over 40k km ... so far no problems at all. touch wood! i've pre & post dynos showing increased performance that HIOP claim. Car has been in and out AD for diagnostic purposes & software updates but nothing flashes up or CEL appears. in term of performance, its not day & night difference between stock and HIOP tune. i feel that at high RPM and above 160 km/h is where the difference can be felt.most important is the reliability of HIOP tune. may not be the most aggresive or powerful tune available but HIOP is very reputable and Fred provides excellent after sales service</blockquote>