Thats exactly what I did, it was an on-the-fly plug swap. Thinking that it was a faulty plug I put a new P3 in and it still had the same effect. I then switched back to a new OD and performance picked back up. Remind you, during all of this I hadn't touched the tune yet. But when I did WOW more power with lower temps. Could it be that the 97t is actually hotter than a P3 regardless of what the package says? The only reason I ask this is because that's what it reminds me of. I figured that after I installed the P3 I would be richening the needles but I actually had to do the opposite.