I have a brand new set of Kooks Customs Headers in the original boxes for an 2010 Challenger RT. They will fit on later Challengers 5.7 or 6.1's as well. The setup that I have is for a 5.7 the only difference is the collectors that come off the long tubes. I bet if you contacted Kooks you could send the 5.7's back and they will send the 6.1's if needed. Im asking $1550 shipping included OBO set new runs about $1800 plus shipping. Let me know want to move these quick. Thanks.