I have an STi system here if its any good to you? including the downpipe e.t.c.
I have gone Cobra system with Sports CAT and Harvey Smith Up-pipe via Alyn at AS along with Ported headers e.t.c. and albeit loud, it works well.
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
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RM Performance http://www.rmperformance.co.uk
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