850cc should be good for 400+ easy..
I’m running RCM 850cc and at 370bhp they are only 60% according to my last map..
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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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