My 2000 model Boxster S has 160 000 km on the clock and is my daily driver. Its in fine overall condition but has a 'hiccup' at around 6 000 r/min for half second, then continues to rev smoothly. See attached dyno graph.
Any idea what could be the cause? The guy in the dyno shop thought it could be the fuel pump but the issues dont add up IMHO.
Inlet resonator maybe?
