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  1. #1
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    Diameter of oem xpipe - where primary cats bolt up to headers

    does anyone have the exact diameter?

  2. #2
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    1 out of 1 members liked this post. Yes Reputation No
    I'm pretty sure the stock piping is 2.5"
    2006 AW/Black ZCP 6MT


    Click here to enlarge


    E46 M3 Owners of the World <---- Join the FB group!!


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    Click here to enlarge Originally Posted by folgrz Click here to enlarge
    I'm pretty sure the stock piping is 2.5"
    Thanks.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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