> My stock mufflers on my '90 Nissan 300ZX are rusting and need replacement.
> May I replace them with "free flow" performance oriented muffler systems?
> Rule 13.10 says I may substitute any part of the exhaust beyond the cat
> converter, but later mentions that the rule does not allow for a high
> performance unit. Is that restriction related to the discussion of
> replacing the cat converter which immediately proceeds that statement or
> does it apply to any replacement of the exhaust system from the cat back?
>
It applies to the catalytic converter. Anything behind the converter is
free.
KeS
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