I have a 3" Cobra system with Sports CAT and its good for noise, but does drone on long journeys...
Milltek are popular and do good systems with resonated units to help keep them track and noise friendly.
Always try and go 3" if you can to give best escape of gases IMO...
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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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