i dun think grounding gonna voide the warranty. i've got grounding, VS and other wirings tangled to my battery terminal and yet, still able to claim for the knock sensor which decided to "kong" last year. NO problem at all and no question asked about all those enhancement.
All pros n sifu pls help me... I just got a 2nd hand wira n very urge to have a better sound in the car... Unfortunately im still a student so nid a very very low cost for doing all this things... When the...