320 & 340 have an HKS Super Drager as standard. It isn't exactly what you'd call 'quiet', but it certainly aint no Blitz Nur Spec. Keeping the bung in makes it quieter but also dulls the performance a little. The Magnex 3" turbo-back we have on ours now is said to be noisier than the Super Drager but our next-door neighbour thinks it's quieter as it doesn't make her ornaments dance along the shelves :blush: Sorry, that's probably just confused you even more!
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