Hello, I have installed the last days 2 power stages in the spare wheel pit. I connected the two mass cables immediately to the former fixing screw for the spare wheel. Before naturally the long welded screw is nicely polished except on the metal and neatly lubricated with pole grease. Unfortunately, however, the mass does not seem to be quite sufficient, since I have a quiet typical noise on my boxes. I already have the chinch cables across the car g Elegt, but without improvement …. …. so please tell me where I find a super mass, at least for one of the two final stages ….. Thank you!!! LG Calimero2.0 16V P.S. The masscable has of course only a limited length of about 1.2 meters!!!