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Update: I took everything apart and started again. The install was fine except the worm clamps were not tightened enough and gases were escaping. Problem solved and CEL gone. The stuttering sound between 6k and redline when hard on the the throttle remains however. I'm thinking it's the nature of the Karbonius and the resonance it produces. This may simply be the cost of using after market products, there's always unknowns. Sure wish there were OEM CF pieces like this because the fitment of that airbox lid is very sketchy. Anyway the car still sounds epic and I think I can live with that slightly odd sound. If I can set up my iPhone I will try to take some video. Can't be heard with windows down only windows up.
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