If you swap OEM HU with an aftermarket one without using a CANbus interface, you will lose the following features: Active and Dynamic (without Blue&Me) - HU/Stereo's LCD dimming alongside cabin MID illumination control adjustment. - Speed volume feature Emotion and 90HP (with Blue&Me) - In addition to the two features mentioned above, you will lose Blue&Me system and steering mounted audio controls. There is no error otherwise and everything works perfectly. @fiatcrazy- How does a 2-DIN HU fit in Punto Evo? Because I saw it 2 weeks back and the stereo isn't 2 DIN in Evo. @ghodlur- I would not recommend brands here but here is a set up that I like. Head Unit: Pioneer 7590SD (USB/AUX/SD/3 RCA/ Rear USB/LCD display with animations/MIXTRAX. (Price: Rs6000-8500 online) Front Speakers: JBL GTO608c 6.5" component speakers in doors. (Price: 4000-5000 approx. Variable). Rear speakers: JBL GT5 series 6.5" co-axial speakers mounted on MDF spacer rings. (Price: upto Rs2500 approx.) Damping: Front doors damped at least. All 4 doors damped preferably. (Price from Rs1500 for 2 door basic damping to Rs10,000 for full damping of all four doors in 3 layers using 1 bulkpack of Dampmat Plus. This set up is sufficient though an amplifier and a subwoofer combo can be added as well. But mind the boot space in that case. Regarding fitting a 2-DIN HU in Fiats, this is what has been done by a member before. Pic taken from internet and is already there at TFI somewhere. Besides this, someone has installed a 1-din system with a motorized display.