Having issues with putting a chevy 454 in my 86 gran prix, anyone know whats involved with the exhaust setup. Wanted to go with a 3" long tube headers but wondering if they'll fit, or is there any swap headers I can get. Any input would be helpful.

 

so do you have a third gen or are you just posting onhere cause you cant find any other forum?? not exactly a third gen question you would most likely be better off lookign at a gran prix site.