I'll have to check my HKS out, I have the same raddle going on with my nismo, it starts around 4K while the engine is under load. It won't do it if I just rev the engine, just during acceleration. I was starting to think it had something to do with the engine vibration being transfered to the exhaust. I'd love to get this corrected.
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09 Nismo - HKS | Berk | HPS | K&N | Zspeed
09 Maxima | 09 CBR 1000RR | 02 CBR F4i
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