Exhaust Piping

Now.  Most stock 3.0L's come with either a 2" or 2 1/4" exhaust piping.  If you are looking to upgrade your piping you will loose low end torque and not gain any significant high-end unless you upgrade your intake fully.  A 2 1/4" system is good for an everyday driving with minor work.  A 2.5" is best for the all-out upgrades.  The best exhaust piping you can get would be a stainless mandrel-bent system from the donut back.  FWD Performance sells systems for a decent price.