Hi do you have to have a centre silencer to pass mots and also how much loader will it be with a piper backbox
centre silencer
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#1
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#2its not needed no, u only need the cat, piper boxes shouldnt affect the mot.
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#3Jeers will it make the exhaust much louder
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#4yeah will make quite a bit louder!!
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#5Jeers even with the cat in place
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#6To pass the MOT you need at least one silencer and a cat. But remember, if its too loud he will fail it. But i doubt a piper back box on a standard car will be too loud.
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#798dcb if i remember correctly

should be fine with the piperbox fitted