What mods are you looking to do? My friend owns a shop in Staten Island and the work he does to cars is unbelievable!! He does everything from audio to interior / exterior customization to performance mods and I 100% trust him working on my car when I need to get something done. Here's a link to his website -
http://www.xclusvautosports.com/index.html
Let me know if you want to get anything done by him!