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From what I've read on here anecdotally, fitting db killers is fine but they will most likely mess up any fuel map you are be running. So ok for MOT but probably not long term and as you know they sound and run so much better when they can breath better.
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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