Just for our discussion...exhaust system in cars includes muffler to reflect the sound waves produced by the engine and reduce high pressure from internal combustion. Hence different capacity engine use different size muffler. To get more power without the noise we can use stock muffler from small cc engine and fit to our more larger engine...like Proton 1.6 use 1.3 muffler....or Kelisa 1000cc using Kancil 850cc muffler.....there is a lot of stock muffler laying around in those exhaust shop rite.....?