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DK Valvtronic

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HI everyone, I have recently fitted a DK Valvtronc exhaust and a pair of K&N filters. The car is now undrivable in both valve open or closed above 2000rpm so thats 70mph. The resonance inside the car is unreal. Has anyone experienced anything similar? Is there a fix? I mean the exhaust was £1000 and the fitting another £500 as they hard wired it in 

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How big are the silencers on the system. Unfortunately it sounds like it's just a free flowing system which are always louder.


Are the cats still in place or was this manifold included. 


Unfortunately £1000 is a cheap system these days especially for a valved set up. 

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