We make the NA parts in 2.25" as it offers the best power band. We can make them in 2.5" also if you wish. The web site has the mid pipes for NA listed as 2.25" and the info to call for a different size is there also.https://specialtyz.com/shop/300zx/exhaust/sz-225-test-pipes.html The TT pipes are listed in the 2.5" and 3" sections, those have different bends than the NA pipes. Stock NA pipes are 1 3/4".
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