so do these things actually work very well? My buddy has one on his auto v6 mustang and it seems to have made a difference. It can now screech the tires when it shifts on 275s.

For my car what effect would one of these have?
http://www.ws6project.com/user_stor/...8eef2d29f2517c

 

No.

 

Lol! The canned tune handhelds work pretty decently, I've heard tunes for some vehicles are better then others.