I HAVE A 1990 AUDI 90 V6 WITH HIGH NOX IN THE SHOP. WHEN MANUALY OPERATING THE EGR VALVE I GET VERY LITTLE CHANGE. HAS ANYONE HAD ANY EXPERIENCE WITH A PLUGGED MANIFOLD ON THIS ENGINE. THE EGR IS IN A TIGHT SPOT & I WAS WONDERING IF THEY PLUG IN THE INTAKE PLE... Login to read more.