I am wondering if my exhaust has been part of my problem when I did the rear cat and res delete I did not put in a x pipe so this might be affecting it. I am also wondering about the condition of my front cats I think they may have started melting down do to my previous lean issues which would be adding back pressure. My new exhaust from Rob arrives today so I should be able to answer both questions by tomorrow. I am still very happy with my new tune though I almost ran as fast as my best time with euro in temps a good 25 degrees warmer and a fairly high DA.