First, I think DerAlte already addressed this, but before spending too much (like on components), remember that MM540 is not a ICE friendly vehicle since it generates a lot of engine sound. So, don't expect too much.
Second, be careful about your ICE equipment. There is a sticky thread guiding you to keep your ICE secure. Get the HU mounted properly and remember to take precautions when you park you car.
Cheers! |