Has anyone tried upgrading the car stereo for new cars at this Pete's audio in Subang Jaya? So far this is the only one that looks professional and uses plug and play connection or installation to prevent issues with new car warranty.

The video on YouTube looks informative and professional and there are many projects done, with mostly good reviews on Google Maps. Most of the projects didn't touch the Head unit as he mentioned current HU in modern cars are good enough. Only speakers, subwoofer and DSP are upgraded or added.

What are the results for anyone who has tried this outlet especially for new cars? Any rattling sound introduced after the installation due to loose wiring or fittings from opening up the door panels?