They will always be suss about a hi mount manifolde and turbo arrangement
Although aslong as (i am assuming its external gate) the wastegate pipe is plumbed into the main exhaust you sould be ok with with that, also if you can get an inclosed intake box as they will crack a wobbly about a open pod filter set up, if its possible and also if it has not been done already plumb back your BOV
I have had a rather suspicious looking skyline (matte black with huge wheels lol) and usually was able to go out without getting harassed, but its all in how you drive the car as they will soon learn your car and it will become a vehicle of interedt if your car has been reported/seen doing stupid shit, thats when they pull you up for no reason and go defect hunting, also if its not a local car they will pull you up and suss it out and maybe keep an eye out for it for a few weeks or so
But if the vehicle is ok and you don't drive like a lunatic you should be fine
Cheers Marty