hotplates34

its not oily or just around the exhaust, its like when you just polish your car and all the file fluff sticks to it but with dirt, know any ways to improve this low pressure behind car? like a roof spoiler or changing the tilt on the rear wing?

I have an R34 GTT and every time i take it for a drive the rear bar gets filthy, even on perfectly good days, take her to the car was and by the time i get home dirt has stuck to the water and has dried, i was reading that the shark like fins on bmw's are put there to keep the aero stuck to the car so the air isnt turbulent behind the car causing the bumper to get dirty, im sure there would be improvements in performance by removing this drag anyone know of a fix?

Hi first post normally just read topics until I learn how to fix it but this has stumpped me I have an r34 gtt fairly standad I just put in a fmic and ebc so I have the boost for my solenoid coming from the compressor housing as far as I read it's right but under boost it doesn't open the wg I have adjusted the ebc settings every which way possible, I pulled the wg off and put a few psi through it and it moved so I don't think it's faulty, any sugestions would be much appreciated