As a result of using this product, I found that my car is running smoother than ever before .The ZENITHIKE replacement parts have made a huge difference in the performance of my Silverado. I love that it comes with both upstream and downstream sensors, making it a complete package. The installation was simple and straightforward, even for someone who is not a mechanic. The only downside is that it may be a bit pricey compared to other brands, but in my opinion, the quality is well worth it. overSee full review