From Mudumalai you would need to go to Kotagiri - Mettupalayam - Annur - Puliampatti - Nambiyur - Gobi - Chittode - (join the Coimbatore - Salem road here) - Salem - Ulundurpet - Villupuram - chengalpet - Chennai.
I'm bypassing the bad Ooty - Conoor - Mettupalayam Road; also missing the Avinashi sector
4 laning is happening all along Coimbatore - Salem and the Villupuram sector.
Better alternative is to go via Mettupalayam - Sathy - Athani - Andiyur - Ammapettai - Mettur - Mechari - Thoppur - Dharmapuri - Krishnagiri (join the GQ and head towards Chennai).
This would be ideal as you miss Bangalore traffic and you also join the GQ and avoid the heavier Salem sector. Extra distance to be covered here.
You would have to go uphill & downhill to go via TN which would take up time. However you miss hitting Mysore - Bangalore traffic, Electronic City - Hosur traffic also.
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