Thanks everyone for all your replies and suggestions .I am going to go with headers , im not sure which ones yet .We don't have to worry about emissions where I live :-)
I am thinking about adding side exhaust to my 73 vette and I am just wondering what exactly is involved . I am also wondering what do you do at the back end where the original exhaust comes out .
Lastly anyone know where is the best place to get side exhaust ? I am located an hour from London...