My car now has a Prodrive sports cat downpipe and a decat up-pipe, as was as the WRX PPP centre and rear sections, and was measured at 82 decibels the other day, at 4-5K revs. Don't notice it being louder than with the standard cat downpipe and catted up-pipe.
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JDM twinscroll Legacy wagon [previously blob WRX/PPP wagon, killed @ Silverstone Feb 2019]
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