alright guys so here's my issue. this CEL has been coming up for a week now on my daily 03 bug eye. the thing is it ONLY comes on while im cruising on the freeway going over 60mph. these are the things ive checked:

-hoses are all intact
-cleaned the MAF sensor
-airbox is sealed fully
-no apparent leaks in intake hosing
-replaced front o2 sensor (old one was toasted, was all white)
-intercooler has no leaks, neither does bpv
-fuel pressure regulator is dry(no leaks) and hoses are intact

so the only things I can think of are either my headers(pre o2 sensor) have a leak, or the intake manifold. the reason why I don't think its the spark plugs or injectors is the spark plugs were replaced this march and if the injectors were done the car would have a misfire right? the reason why im stumped is the car runs PERFECTLY fine. purrs smoothly and idles smoothly... I want to take care of this asap before it does more harm to my engine. so any help or input would be appreciated. ive been researching this for almost a week.

thanks its advance I-club.