This is my first trip to the muffler shop. I had the Insynerator 2-chamber mufflers installed. I thought it was ok but a little too quiet so I went back and had the stock resonator and cat replaced by a Insynerator Bullet muffler and high-flow cat. I had costom-made headers I bought on E-bay a few weeks later. It took 2 months to get the sound right but it was worth the trouble!