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the perrin systems are really a trade off.
go with res cat back + non cat front pipe and you have more power but also more weight.
go with non res cat back + cat front pipe then you gain less power but you also lose weight.
if non cat front pipe + non res cat back isn't too loud then that's the best solution for power & weight gain.
personally i think i'd go for non res catback and cat front pipe as i don't mind a little noise.
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