Update, I have found the reason for the resonance issues on deceleration, it’s the lack of valve on my chosen Cobra system, this was discovered last week when I blocked the passenger side exhaust pipe with a rolled up rag, took it for a test drive and the drone has gone, so I have ordered the valve section from Cobra, it’s hard to understand why, but thinking about, Ford new too, hence why the valve closes on deceleration, and opens on start up and hard acceleration, it was a small issue with the standard system and delete valve resistor, I do remember increased drone on deceleration down hills, hence why I tried the rag up the pipe, so I recommend all who order the Cobra system to get it resonated and valved, or you will end up with serious drone.
Mountune M380 package
Mishimoto throttle Pedal Spacer
Mountune Hard Charge Pipes
JCR super low seat frames x 2
DSC Suspension Controller
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