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Exhaust Rasp?


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I've got a 1.6 Zetec S Petrol and recently swapped the manifold out (De-catted), I have a ST-2 exhaust still with backbox and centre box however at over 3.5k rev's i get a horrible rasp noise, Could this possibly be because i need to upgrade my exhaust too or is there a way to get around it without putting the cat back on. 

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