I have the Cobra 3" system with sports cat and agree - it does buzz on the motorway - however I do like the grumble it gives. Didn't get flagged at the Ring but that's prob coz I didn't drive quick enough! ha ha
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
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