The Z/28 already has a very good set of unique high flowing exhaust manifolds so if you're going to upgrade ARH or Kooks are the only ones worth the effort to obtain IMO. If I ever do heads, cam and exhaust those two brands are the only ones I'll consider. Track only? Delete those cats so you don't duplicate the unfortunate engine damage that fellow member Docwra experienced.
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2LS: a TREMENDOUS machine. Z/28: it's a BIT MORE POWERFUL, of course.
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