i have the exahst but not sure if the 3.9l headers would fit the 3.5l my question is what is the engine code for it as well i like to open it up with breathing but kind of lacking the parts to find every thing i want for the v6 3.5l motor just want to know if the 3.9l header will bolt up and be good for the3.5l

 

I dont think it would bolt up, the 3.9 is dual exhaust and the 3.5 is a single exhaust, but im not sure. As far as i know there isint much to do to these 3.5liter engines. I'm in the same spot as you, looking for performance parts with no luck.