Indeed, it is necessary to find a professional modified stereo so as not to make a mess. Professional ones are not necessarily expensive. If you want to modify the stereo, which one is the best for sound insulation first? Without a good speaker, no matter how good the speaker is, it can't achieve its best sound effect. As for the speaker, it depends on your style and hobbies. You should go to Chengdu Xuri cool car Car Audio Store. I think they are professional, hand-made and the product quality is guaranteed.