I have a 2006 Mustang GT with a JLT cold air intake with a Xcal. tune. I'm showing a code P0340 and would like to take it to the dealer to get checked out. Should I install the old intake system or can I leave the one I have.

 

here's anoither thread on the same

https://mustangforums.com/m_3804603/tm.htm

 

personally, i would put the stock
intake and tune back in. it's so easy
to do.