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I had a ScoobySport Downpipe, standard mid-section (which doesn't contain a cat or anything anyway) and magnex 6x4" oval back box.. this was 86db .. the Downpipe + Super Drager (mid section / back box) wasn't much louder, still under 100db, 95 ish I think.
You'll probably get early 90's dba at 3500 rpm 1 m straight behind the exhaust (FIA Regs I believe) Full revs it'll peak at 100+, tick over down in the 70's