So I have been quite perplexed the past few days with my 2006 Dodge Charger SRT8. When I originally bought the car it had stock headers and stock catalytic converter on the car. But it had an aftermarket straight pipe from the cat's back. Nothing name brand, it was just a custom shop job. Over the past few months my car has been on jack stands and I have done many things to the car, one of which was I recently installed long tube headers that I bought from my friend who he had on his C 300, 5.7 Hemi . Once I got the car up and running I drove for about a week with just the long tubes dumped to nothing. I finally got tired of not being able to hear myself think so I went to an exhaust shop and had them install two aftermarket (I believe universal) high flow cats and mount them to my old exhaust. So now I have long tube headers, high flow cats, and straight pipes from the cat back (not sure if it makes a difference, but I also did a gasket match on my intake manifold). Now where I am a little confused is; I feel like the car is now more quiet than when I had stock headers and stock catalytic converter. I know it's been a long time since I drove the car, and then I started driving it with just headers on it. But even my girlfriend who knows not a single thing about cars said she feels it's quieter than before. How is this possible?! Is there a break-in. On the high flow cats? I have only had them on for a few days now. I maybe Drive 40 miles a day.
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