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Do you know what is the diameter of the tube starting from the down pipe? If i change with a bigger one, what deferences I am going to see?
 

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it is 2" diameter almost but if you get a bigger diameter pipe it will increase the performance of your wagon along with a louder sound. there are many custom made down pipes available in the market.
 

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But for better performance you will also b needing a better intake system that can fullfill the reruirement of greater air needs. And for all this you must have to relaod the code in yourcar's ECU (electric controle unit) of the engine.
 
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