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Message: <blockquote data-quote="kweng84" data-source="post: 2290786" data-attributes="member: 21172"><p>"Bigger for more power" term is used depending on the engine. If transplanting to a bigger cc engine, yes of coz bigger is better comparing with the stock exhaust system. But, what is needed to be bigger? It is the inlet size of the exhaust mufflers, piping and extractor as well. Bigger inlet size causes bigger volume of exhaust exiting the system and thus, generating the next horsepower will not have any backpressures that might cause damage to your engine. Anyway, if this still don't convince you anything. The maximum inlet size for your stock 1.3 wira, i assume manual tranny, is 1.7"-1.8". Best for pick up to drive in city (remain good FC) will be 1.6" which is slightly bigger than the stock 1.5".</p></blockquote><p></p>

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