if your interested in how much of a bitch it is to install long tube headers i made a post of how i installed them on my 03 GT took 8 hrs and lots of patience but sounds f****** awesome and such a noticeable difference. something you have to remember is with any profromance upgrade your gonna lose some gas mileage you have to pay for speed :)

https://www.cmoc.ca/forums/t11325/
here's the link to the headers install