The idea of the garage is probably that they can but the shutter down when remapping cars during the week so the people working in the rest of garage don't have to hear it

The place I went to in nottingham is doing the same, so that people working on cars don't have to listen to it
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold