These headers are great! They look great and sound great too. I installed them professionally, but the silicone pads that came with them have already burned out! They looked cheap and flimsy but I made the mistake of listening to the muffler salesman who assured me they were good. I had to use factory multi-layer steel pads that cannot burn through. When it comes to performance, I can swear it's a definite improvement over the standard! In the past my V-8 2000 Tundra would downshift when towing