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Standard resonated as far as I'm aware. That was gonna be my next point re the non res centre but does that not run the risk of becoming 'droney' on longer runs?
Have you got both of your cats in still aswell?
I find mine fine on long journeys, cruising at around 3k rpm in 5th and the sound isn't that loud. You can still hold a conversation with a passenger. With an STI and the 6spd box you'll be lower down the revs.