If u have a gen 3 Durango they are difficult to put in because there's no room to put the bolts on the headers themselves. I recommend o2 sensor extension which kooks doesn't supply they give u only two long extension. On the durangos you need four in order to connect the o2 sensors. I definitely recommend these just make sure you set aside at least 8 hours to put them on.
Round 2 for Force II on my 99 Durango
Liked this deep moderate sound enough to replace my 7 year old catbck with the same exact system again. I have many short trips so I get more condensation and rust inside my exhaust than most. Also bought from AutoAnything again! They had the best deal both times!