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    cpearson's Avatar
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    custom exhaust question

    hi, what's the correct bore for a z20let exhaust, 2.5" or 3" ?.

    thanks
    chris
    www.l4leather.com Custom retrims, ICE, alloys, bodykits...list is endless...customer service is second to none. www.collardracing.co.uk

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    BenC's Avatar
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    Most manufacturers make 2.5 inch systems but these are only cat back, the best performance would be with a 3inch downpipe and 2.5inch cat back...
    Corsa C LEH 4x4?

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    thanks ben
    www.l4leather.com Custom retrims, ICE, alloys, bodykits...list is endless...customer service is second to none. www.collardracing.co.uk

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    Quote Originally Posted by BenC
    Most manufacturers make 2.5 inch systems but these are only cat back, the best performance would be with a 3inch downpipe and 2.5inch cat back...
    The best size downpipe is the size that matches the exit of the turbo, going from a 2.5inch opening to a 3inch opening would slow down air flow which would meaning less air getting taken out of the turbo .

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    If the size change was instant yes but not if it was gradual and designed properly.
    Corsa C LEH 4x4?

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    If a custom place can produce something like this then it will be worth the price , once you have a nice big downpipe you need to watch for boost spikes that can appear .

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