'97 4.6 V8
Put a GenII Intake, and opened up the exhaust with a Gibson cat-back. I have realized modest gains but not quite what I expected. Seems to be several flat spots in the run up through the gears.
My questions are:
Should I have replaced the cat as well (130k miles on truck)? I did not want to install headers but if a more free-flowing cat is available that's no problem. Will the computer adjust to the increased air flow/exhaust, or can the OEM computer be "re-mapped"? Should I take it in and have a chip installed?
Thanks! Any ideas will be most appreciated.
Jeff