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Thread: bigger exhaust bore?

  
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    rob16v's Avatar
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    bigger exhaust bore?

    getting a new centre pipe to go with my back box on friday, my m8s are telling me to get a bigger than standard bore size pipe, anyone had any experience with bigger bore pipes?


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    i think for n/a cars the maximum bore size is 2 1/2" I still don't know entirely why that is as they say you'll lose back pressure. and i always thought back pressure if what you want to get rid of anyway lol
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
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    What you'll lose on a larger bore (or one too large for the engine) is gas flow rate - at lower rpm's this will probably lose power, with the potential (unless the bore is too big) of gaining right at the top end.

    For NA engines there's little point usually in increasing the exhaust bore, best off sticking to a straight through catback system and if money permits a decent exaust manifold and sports cat too.

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    thanks for the info guys


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