vibration when starting car.

[BrianGT2015]

i put long tube headers on my 2015 mustang gt 6 speed. Every once in a while when i start it up i get a hard vibration in the passenger side. It goes away after a few seconds. Car drives fine. I do have a little more vibration in the shifter when driving down the highway. I figured that might be from the long tubes and exhaust. I have done 145 mph in the thing since the install. I figured that if i put something in wrong it would give up by now. Any suggestions. Its not the typical grinding noise. I know the starter is installed correctly. I checked it already. Could it be a motor mount?

I also did the 2018 manifold swap. Now the hoses are not set how i would like them. Could a cripped hose cause a hard start up then go away as the air flows through and unbinds the hose?

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