can we change the h4 bulb that we are using to other type? like H1 and so...is it against the law? my mechanic said need to modify the relay to support it..is it true?
wan ask that when i off my player then my woofer got 1 boom sound that come out from it, so i ask my friend , and he say is grounding, so wan ask that, is't? and where got do grounding and how much about it? Got DIY...