Quote Originally Posted by 04monte View Post
Headers do not require a DP, it is built into them. If you do a DIY FWI/CAI, 180 tstat, autolite 605's you might be able to do a 3.5; but not unless you or someone you know has a scanner. The stock would be crap for that pulley as wel so you would need a tune/new pcm for the smaller pulley.
TOG Headers don't have a DP. That was a separate purchase.