Normally sound accs shop will have contact, you can check with them... Many people will mod/upgrade proton car, other brand need to rely on technician's skill...
But why you wanna increase amp output? ICE modding?
All sifu sifu,need some advice here..
what is the best rear spring for my saga 1.3 tat trunk always need to fetch heavy thing?
-accord sm4?
-sunny?
-saga sport spring?