I'm planning to change my muffler and/or the extractor. The problem is i'm new in this area and can anyone tell me what to look for when buying. For the muffler what price should I expect. Is the cap ayam one cost around 100-250 any good? Or should I go for branded one. And the extractor... which one is good for auto car... 4-2-1 or 4-1? Budget around rm500 if possible for both.