ok maybe a newbie question, but do LT headers fit on my stock Y-pipe or do i need an aftermarket Y-pipe? basically, can i just buy the headers or do i need any other parts?

 

You will need an aftermarket Y-pipe. Most companies sell a Y-pipe to fit their headers.

 

You can also have an exhause shop fabricate a ypipe for you...It costs around $75 to have one made here.

 

my flowtech headers had a factory built Ypipe that was built well, it fit absolutely perfect and was only $130

and realize that most longtube headers don't have or even offer a catted ypipe. usually you need those custom made