Looking to do some audio upgrades and am looking for a really good installation shop in the NYC or LI area.

Any tips would be appreciated ...

 

I had an Infinity bass link installed here on the Island at Avenue Sound, which is on Deer Park Ave (in Deer Park). They did a pretty good job, and were really helpful when I had to go back for warranty work. I have heard that Main Street Stereo in Sayville (on Sunrise Highway) is excellent when it comes to custom jobs such as building boxes and such. Hope that helps.