Originally Posted by Carcrazygts2
If it was boosted 3" would be great, but its not. I wouldnt run bigger than 2.5". I know with 3" full exhaust on my 2v 5.4 it moved the peak torque band up about 700 rpm.
On his I can't see it making a huge impact.
If it were me, I would do 2-3/4 from the collectors to the DI/SO with a 3in out.