Alright the other day I tested my car with my scanner and did a KR sensor scan, just to see if I still have any KR after I just put headers on and 3inch full exhaust.. So all my mods are listed in the bottom box and i check my fuel pressure at idle its at 50psi then at WOT its 62-64psi. Before the headers she had 7* of KR now shes down to 4* for fuel all I run is shell 93, but this weekend im going to try something and see if it helps out any im going to get down to 1/8 tank of fuel then get two gallons of 110 octane and see if helps the KR at all cause if it doesnt then it could be some false but I will find out. I just wanted to see if you guys had any other ideas on what is should do or test. So let me know thanks.