Not sure on ur part but a Harvey trick up pipe and ported headers from alyn at AS Performance would be a huge improvement...
Think STi up pipe is an improvement on wrx one also...
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
&
RM Performance http://www.rmperformance.co.uk
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