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. muflerectomy on really works on the dervs i believe, they sound great at about 2-3k rpm but very loud when at higher revs (about 4.5k rpm) and cos your power is only coming in then on the petrol i think you might find it a bit too much(chavy) IMHOno mate it sounds different to that when it is boosting it makes a different sound though. it sounds similar to an evo fq340, more like rushing air at high pressure if that makes sense?