Every aftermarket pipe I've seen is 16g. Since you're about weight I'd find 18g somewhere like most factory systems are. If it wasn't 304 I'd be surprised! Only cheap stuff like magnaflow and flowmaster use 409. 304 is not magnetic and 409 is magnetic. Also just FYI, when someone gives a size pipe most are OD. Tends to tick people off when they measure and its not ID and they wanted that for more flow etc.
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