Had my 2009 Mk5 GTI Pirelli (Edition30) stage2 tuned today by Eurodyne from one of their maps.
Got lightweight Rays wheels
Intake
Big downpipe no cat and custom free flow exhaust

Went out on the motorway today and had a few runs against a good friends 2007 GTI K03 with downpipe and Stage1 APR tune.

His car sits virtually side by side with mine all the way and only after a few attempts did we notice the K04 pull a fraction in front at higher speeds.

What is going on?