I have done an indicated 130mph (on a private test track of course) and always find my ST170 just seems to run out of Puff at high speed which is a shame because allot of high powered cars that i can pass in accenleration eventually catch up with me im thinking maybe its a fuel delivery problem at high load. Maybe a problem with the map, maybe the dreaded fuel pump on its way?
Not had it RR'd but compared to other ST170's its very strong and its performance on the road suggests its putting out at least factory figures, unlike many of the 155bhp ST's kicking around. I have a Cat back Mongoose