As an automotive enthusiast I had high expectations for the exhaust system on my Pontiac .I decided to try out the Dougs Headers D564 R exhaust system, and it did not disappoint. As a result of my tests, I determined that this system delivered exceptional performance, producing an assertive sound from my vehicle and boosting its horsepower. The installation was straightforward, but the only downside was that the pipes didn't fit perfectly without some slight adjustments. Overall, I am thoroughly impressed with this exhaust system and would recommend it to any performance car owner..