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If I change the centre section and back box on my MY02 STI will I need to use the 02 defender or is that just for the front CAT removal. Also can any of you guys recommend a good sounding BB, I saw and heard a TSL firebox @ japfest found it a bit noisy and 5" pipe a bit OTT for me was told about a group N box but didn't hear that one any ideas 4" pipe max I reckon.
CHEERS
MIKE.