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Yep I agree, all of your research should be taken with a grain of salt. Seems like the difference in your experience and the article would be the tune.
But I don't think I've ever heard someone described a 3" perrin system as raspy though. Louder, yes, but raspy, not so much. If you replace the headers with catless then yea it might get a bit raspy, but I'm pretty sure OP has stock headers correct?
To answer the OP's question though, it all depends on what your definition of "noticeable power" is. The 3" will give slightly more hp/tq than the 2.5" but most would consider it not a very noticeable difference. So it would come down to an extra ~$150 for the 3" parts and you'd get a small bit of extra hp/tq and a bit louder exhaust. Good luck with your decision though, hope this info helped!
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