Vibration at cold start (no hesitation)

[Xavierviana]

Hi All,

At cold start I feel the whole car vibrates, nothing drastic, let say its not super smooth. But you can feel a bit of vibration on the steering and the seat.
There is no hesitation and the Idle is firm.

After the rpm drops to 900rpm< it smooths out.

I have a muffler delete, maybe the loud sound, vibrates the car a bit?

Is this normal?

(Let me know your experience with your coldstart, specially first start of the day.)

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[Racerx009]

Louder Mufflers will give you vibration on cold starts and wait till you do long tube headers