I have been reading up a lot lately on the cfm-tech.com website about different tbi tune-ups and ran across an article that said the 3-wire (heated) O2 sensors work much better than the old 1-wire sensors especially with headers (which is my case). Said they run much better when cold and generally better overall. Anybody tried this setup? Does it work pretty good? My 88' 355tbi with vortec heads runs downright horrible when cold and hopefully this will help with the problem. Also thinking about getting one of their tbi spacers and bored out throttle bodies but thats another story. Thanks in advance for the replies.