IMO, the non resonated test pipes did introduce a little rasp down the road which I didn't like, and became (police magnet) loud lol. That was why I fitted resonaters in them later on.
It is a different story with HFC's though, I'd say it has to do with it becoming very loud and not a rasp issue.
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'14 Viper GTS
'08 RB'd G37S - Sold
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