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.
2015 392 Shaker Challenger
Happy with my order and purchase. I was on the fence between Stainless works and another brand, but these headers are high quality. In relation to power, it is a very noticeable gain and I have not tuned my car yet (it feels like I am on Track mode at the default setting). The sound is great, nice rumble, not loud at all until I go WOT lol. On another note I did notice that my gas mileage improved by up to 3mpg. So I am very pleased with my Stainless works long tube and i got high flow mid pipes