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Very true! they measure us some 3m from the exhaust! Have gone to the booth with the rear muffler stuffed full of steel wool. Until I saw a rx7 with the same cheat catch fire....When talking sound limits, remember it's not only the decibel limit number, but also the weighting (typical A), response speed (slow or fast), and most importantly the distance between the source and meter. Doubling the distance reduces the sound level by 6dB.