Guys, I have planned of installing auto up windows. ie: windows close automatically when the remote 'lock' is pressed.i want to install them in my Linea 2012 dynamic. i thought of doing it outside .so will this fitting hamper my warranty or should i go to the dealer for its installment ?? Also suggest me whether to go for teflon coating,under body antirust,a good brand sunfilm(any code of sunfilm if you know).