Yes it is...took me ages too... but it the only wayI poked a screwdriver into the rubber, then tried to make a bigger hole in it. Eventually got the 4AWG through. Took f**king ages!!!
Once eventually through...take the airbox out to gain access to it.
So what rubber are we talking about here mate? The rubber that surrounds the gromit?
Yeah the airbox won't be a problem, just wanna get this damn wire through.