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You just mentioned what the difference is:

-<b>"True" cat-back</b>: Consists of mandrel-bent tubing, which means the piping is 2.5" where it's straight, and 2.5" where it bends.

-<b>"Custom" cat-back</b>: Conists of pipe bent tubing, which means the piping is 2.5" where it's straight, but the metal is stretched for the bends, and it ends up being generally 1/4" thinner around curves.

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